Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb755a7d4a8affa…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 04:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8cbcb3fbc74c8f2c4d939c34fec7a679 SHA-1: f52535068357cf42db40a1ec5d6f6a5d0e5797f8 SHA-256: 9cb755a7d4a8affaf09cbbcb3c6926ffcdbe5edad0a53309bfc2ba8100f2522d
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/sinorekulagesefutasu.pdf.
  • 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://zajinet.ru/wix?keyword=pnl+pdf+gratis PDF link annotation
    • https://cdn.sqhk.co/kimamena/c7ghIkS/28377219995.pdfIn PDF document text
    • http://boterilutonesi.iblogger.org/99267285356.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/BihNTWl/dimikofixewoxab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_60462e581f9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_604aa8b8f143b.pdfIn PDF document text
    • http://jabisoj.22web.org/pozulitakabun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fd09e88d9c7c.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/ChJqhfz/maxeruzigijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/fiahgNj/duzanukipugox.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/quick_guided_meditation_for_anxiety.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/sinorekulagesefutasu.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/muvunukilinad-lowig-zadubuzus-ruraguvilir.pdfIn PDF document text
    • http://zatorigixoluji.iblogger.org/helping_verb_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/D2z1ia0/hole._io_unblocked_games_at_school.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/walubof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikorizerijegiv.rf.gd/79828641597.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/ng_nhp_icloud_nh_trn_android.pdfIn PDF document text
    • http://wetiruri.epizy.com/xazulupotulumafad.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/87106310362.pdfIn PDF document text
    • http://semomudunetowa.rf.gd/lung_cancer_journal_articles.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5212 bytes
SHA-256: f41c2fe9397a8e0714ce97c779a0eb70a6402deb54f1613c5d978b75eb746785
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 14444 bytes
SHA-256: b357523f9dedcc274561cd1cd33557272ddec40a4f26ae3b0285be0ec3199ca2

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