Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f660e31e037af32…

MALICIOUS

PDF

71.0 KB Created: 2021-03-17 08:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8362180bd2c8ca1fe80f0e207ca5752 SHA-1: aaa5a1e70e49b9fccb908c7af17f9fba0cf3c542 SHA-256: 1f660e31e037af323436dfb1f99b0c1792b7c62c0a517d1f94f16d900d319a6e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=python+too+many+arguments+for+format+string PDF link annotation
    • https://cdn.sqhk.co/tedefoso/jjKqIgc/79032666576.pdfIn PDF document text
    • http://omynutural.space/how_to_tell_you_have_a_bad_o2_sensorb92pa.pdfIn PDF document text
    • http://xukejufivakege.iblogger.org/how_to_fill_out_a_1040x_amended_tax_return.pdfIn PDF document text
    • http://xudikuruno.iblogger.org/fuvotafozogediru.pdfIn PDF document text
    • http://in-arenas.com/zaxusigupovusetigowozovcm5c.pdfIn PDF document text
    • http://apple-fruit.space/reading_skills_activitiesfmfg5.pdfIn PDF document text
    • http://getfreecreditreport.info/facebook_lite_for_version_2._3._6c42aj.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/dghieFP/followers_gain_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389074/normal_5ff041e6e49af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_6044965822fc4.pdfIn PDF document text
    • http://zoomita.fun/newtons_law_of_motion_accelerationtj0xc.pdfIn PDF document text
    • http://testvvd.xyz/78381600162z2qhd.pdfIn PDF document text
    • http://shtancircul.site/descargar_audiolibro_la_sombra_del_viento_gratisti3a1.pdfIn PDF document text
    • http://wegansit.space/what_to_eat_at_night_for_flat_tummy3x2yg.pdfIn PDF document text
    • http://italysummer.fun/where_do_heirloom_tomatoes_growatdmd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486765/normal_6039eb63cd4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_604425218cf8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_6048f27fa1675.pdfIn PDF document text
    • http://vilopeg.xyz/are_there_still_american_bases_in_germanyezgdh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/ray_bradbury_the_veldt_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/murijagamolezexoriwatuxik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 5252 bytes
SHA-256: 2a4baebe59f4ff8a9f2a3ae02d7f76ed1a41338806c890661486b89f148ba942
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 11092 bytes
SHA-256: 8d400f9a1f14f191824e8e82ccdc8ae4890aec0d63d01e31bd6e3f51add86c66

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