Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c775873aea08df4…

MALICIOUS

PDF

127.3 KB Created: 2021-04-22 08:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf62bdd3f641373107b00ec4bcaab46a SHA-1: d92d4e7d3fd318325bffe462a9a3b56094433b35 SHA-256: 3c775873aea08df4c9ba9514449fe8ed636d256f3d45fac2f9c9bbd4a60afea4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=html+tags+list+in+hindi+pdf PDF link annotation
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/vuragi-pomafemevax.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/d60b6467517.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/8992642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_603f0166a4219.pdfIn PDF document text
    • https://zoxaxutonixada.weebly.com/uploads/1/3/5/9/135957052/687971.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/gubumudow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_600a5658ec663.pdfIn PDF document text
    • https://visizejafu.weebly.com/uploads/1/3/6/0/136093068/6025648.pdfIn PDF document text
    • https://zekufizow.weebly.com/uploads/1/3/0/7/130775694/patudiribam-mimojivakaboko-labit.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/the_story_of_an_hour_essay.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/zinodurutize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_601bc7604f24e.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/the_bedford_reader_13th.pdfIn PDF document text
    • https://nimivakovi.weebly.com/uploads/1/3/2/3/132302999/lopaxazetusog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://retudazugo.rf.gd/blackmart_pro_apk_terbaru.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_47fb228a4b764ac0864239de55dad981.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_b50a227b201a4244b52984db5495a35c.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_cf3fa359622848c3b941ffdf1603e0fc.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_61c1d726f46a478da6cc8fbf651bffdf.pdf?index=trueIn PDF document text
    • http://tuvewana.rf.gd/24573707272.pdfIn PDF document text
    • http://wivikisirijuleg.epizy.com/manual_cade_simu_2._0_portugues.pdfIn PDF document text
    • http://papitanado.rf.gd/52503724765.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_998a74b5e50943cb9b47ecd47c007b54.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C62 3700 bytes
SHA-256: 95d2858a615de6af6c291cb46db13d1c0454bd6f2ae222242015b9325722564f
font_01_sfnt_off000169a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A3 4880 bytes
SHA-256: d96746d93bd97934cc9a5c18f576cd00cb35bdccbb42ac8e2171e395f32a532a
font_02_sfnt_off000179fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179FA 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_03_sfnt_off0001855e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855E 10292 bytes
SHA-256: d98cdb1a8327251408afd4bf445d43c1c59bc24c03f7b5acac3e116ed24baaa8
font_04_sfnt_off0001a88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A88F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
font_05_sfnt_off0001b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B68F 18680 bytes
SHA-256: 12125ceb638aa702671b09adf3487c31122b045bbcc08908087102ce9a421226

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