Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c2305449a7400c…

MALICIOUS

PDF

86.6 KB Created: 2021-01-13 15:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a7f9aa847ce55afed12f9664bb751277 SHA-1: 150515f7ae54bd0d86f519640b0c13b55bd71864 SHA-256: 74c2305449a7400ca51250da728d5eaf976ebc8dd3721ee125fc87246ea28835
186 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a link farm, with a high probability of leading to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URLs and the overall heuristic analysis suggest an attempt to lure users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafficel.ru/123?utm_term=columbo+a+friend+in+deed+janice+caldwell PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5faf9d0402f06.pdfIn PDF document text
    • https://texosubos.weebly.com/uploads/1/3/4/7/134715033/331181.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/lixifilewud.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/1gguvQI/85644603141.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/eSijAhb/zimakajimunadodovaliz.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/fajodejagod.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/duziwilegifa_mudipase_figita.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/4091350.pdfIn PDF document text
    • https://wudemivezetuf.weebly.com/uploads/1/3/4/3/134318680/foxexom.pdfIn PDF document text
    • https://site-1237907.mozfiles.com/files/1237907/aiou_pk_admission_challan_form_print.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/zifajozugemo-sinasox.pdfIn PDF document text
    • https://site-1168144.mozfiles.com/files/1168144/5161150306.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/zirojopemup/rukobojuzowolebol.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/93654939002.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_off0001153e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 5200 bytes
SHA-256: 8630f8e3b0d9c40290222cc181f6082ae592b7a736dfd73e6469324f434bb7ee
font_01_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 11188 bytes
SHA-256: 571cd50a7a28c1e08ab9f2f1d8601599712610c8643e1f44c0bcaf576f7f338f

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