Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f3ae6fe216dc46…

MALICIOUS

PDF

84.9 KB Created: 2021-05-23 07:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 835cbc3745f345b43374db65d4023ea9 SHA-1: e38b3585baccf0b200bff8eac32026ab227be757 SHA-256: 76f3ae6fe216dc4625f67e887f81305c035b57377612e9030b81a1c256f9d80c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of external links. The primary URL points to a domain associated with phishing and SEO manipulation. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=ejercicios+de+organigramas+y+sus+respuestas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369328/normal_604acb0792abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_60482783872b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fce4f5c8c52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611b97c86d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492245/normal_5ff6028da1449.pdfIn PDF document text
    • https://sewizejego.weebly.com/uploads/1/3/4/6/134679492/xisabupoge-gopuweviru.pdfIn PDF document text
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/jezoxuwav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_601381385313d.pdfIn PDF document text
    • https://derugipuze.weebly.com/uploads/1/3/0/8/130814861/mezoniz_lenuguzatep_mikodemakan_midozusuligor.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/menobekilejuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_602f96500043d.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/roware/tulufixaxoja.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/2996820498.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/wenavabogekek.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/tiwavamek.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/american_assassin_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/las_arras_del_espiritu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/54500937311.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/drenagem_linfatica_manual_pos-_operatorio_lipoaspirao.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/regesabu.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/42255755204.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/rangabati_odia_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/mixepefulidivasuxufoxuteb.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/noden.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_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 5496 bytes
SHA-256: b684dc77010fe84205fd2e1d16819539c188e080817ae60318b47b8679c16517
font_01_sfnt_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 12292 bytes
SHA-256: 9b0061bbe407c1e93621ded588928d31e18c83491cb96d11e6de5774f120cd68

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