Malicious PDF — malware analysis report

Static analysis result for SHA-256 289fcc3abe597171…

MALICIOUS

PDF

87.5 KB Created: 2021-03-29 22:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a0b34fd9bb6e938049dd2460b39e41d0 SHA-1: 1be881133c5ca78b219b8aedb22be0f1d529b688 SHA-256: 289fcc3abe59717177d22010cd28c79a0a097cbc6080bf67dcc6038c4f7f2f4e
186 Risk Score

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. 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 0.9996

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://midufefew.ru/award?keyword=introduction+to+behavioral+economics+pdf PDF link annotation
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/zubevolanasogodew.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/dukarodetekuwizogi.pdfIn PDF document text
    • https://gibotekiwifij.weebly.com/uploads/1/3/4/4/134444926/nasaf.pdfIn PDF document text
    • http://plsale.pro/9980938892l1h3d.pdfIn PDF document text
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/36bbcda89da5c1c.pdfIn PDF document text
    • https://bivesazi.weebly.com/uploads/1/3/4/6/134652180/b0fcb1224d2.pdfIn PDF document text
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/5036888.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/mapeg_rurijukalor.pdfIn PDF document text
    • https://pojaxereb.weebly.com/uploads/1/3/1/4/131482957/golexosafev-kidibeja.pdfIn PDF document text
    • https://sabigakubotel.weebly.com/uploads/1/3/2/7/132740275/7583039.pdfIn PDF document text
    • http://yatvoyya.fun/vowonalodagutoxikdlxd.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/8146687.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/rukag.pdfIn PDF document text
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/1460763.pdfIn PDF document text
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/rugod_ramelenadowiva.pdfIn PDF document text
    • https://vupavekana.weebly.com/uploads/1/3/4/4/134493500/4477268.pdfIn PDF document text
    • http://tikovg.xyz/409274338923lzxs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://belepegaxotimi.rf.gd/units_for_shear_flow.pdfIn PDF document text
    • http://pilakiniza.rf.gd/35122855841.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/14944437713.pdfIn PDF document text
    • http://bikinegisuzuse.rf.gd/alan_kardec_livros.pdfIn PDF document text
    • http://gokujipavelidaz.rf.gd/ek_chumma_video_song_pagalworld.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_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 5532 bytes
SHA-256: f4a100caaa1fc27784a7eec45148522bee10e9fcdcd7581c57d7b29eedd8abdf
font_01_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 10920 bytes
SHA-256: 572547949a64fda6783b327c97f5f3347742524ec1b74b3c7d5fdf8d6946131b

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