Malicious PDF — malware analysis report

Static analysis result for SHA-256 4837a112a56bba55…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 20:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07a6fdc1f36deb0030e78678e7f7b2ae SHA-1: 532b91810ac366062b416c3518ace712dc051a8e SHA-256: 4837a112a56bba559bc33801c65f5dce6b1dbd490348f4451a2f6027b608b8ae
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://druttle.ru/wix?keyword=ge+profile+spectra+dual+fuel+stove+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412583/normal_5fde3a1334a08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_6016309ed6ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_60407af2ddd86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_5fdb55f1889c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fe8fbf3452bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/hjbU9KY/designer_city_building_game_hack_apk.pdfIn PDF document text
    • https://jibajupo.weebly.com/uploads/1/3/1/6/131636806/bupenisuvepubiv_bexefafadexa_letawokugebo.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/bumunumadaxenajepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_6002d1f6a534f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_5fdb01f3d8914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_5fdbfd6e774fb.pdfIn PDF document text
    • https://pawupakupofodav.weebly.com/uploads/1/3/5/3/135388754/71466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_603e54df6a18b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_6037b3ea0ce9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_602c77d1bdb98.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/kadizodupej.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/CXihIja/kingswood_smash_repairs_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_600fcf1df085f.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/rulapasogeladaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_603f0705dbfd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5fe2e3e4b3560.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
    • https://s3.amazonaws.com/dujepav/boon_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/wiputedawab.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/xonez.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/driver_da_impressora_bematech_mp-_4200_th.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/megetematugogut.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5272 bytes
SHA-256: 969ba45b3115bd19ab7447961d8e4312d323d270b293d23a99e09647d8d5988b
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 11380 bytes
SHA-256: 8cc377b3c32a79e263d146f903287468d2493195e46f22eb06e38b591c1b8916
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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