Malicious PDF — malware analysis report

Static analysis result for SHA-256 22677a23f05ee8f1…

MALICIOUS

PDF

72.4 KB Created: 2021-04-06 03:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1de7d4e1474ae98131e60f7a16bdd702 SHA-1: 929d2e7072d78c0fb9851a291ff8fc38e8a2ea43 SHA-256: 22677a23f05ee8f1cb88f4627b9d4fe2c05189715e56a8d52e7c5024d57243f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lead the user to malicious content.

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://leonvi.ru/strik?utm_term=the+heiress+tagalog+movie+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446499/normal_600da2e4c63bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_5fd9ac4c10178.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/swing_trading_for_dummies.pdfIn PDF document text
    • https://tisizapotiw.weebly.com/uploads/1/3/0/7/130776245/6954809.pdfIn PDF document text
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/xapakezunudo.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/consumer_behavior_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_6036aba327d74.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/1728622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49de9c39-e733-4a98-9a98-613abaeb0248/pasibita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fad218-a231-4939-929f-811443f44de9/nigivudonitanilategenele.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_864bec48d45049dbb6ef356420c583ca.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_0c70afa72de04099bb8c71b463da8086.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_4e278fba278f47c49b0afc2ab8ad2075.pdf?index=trueIn PDF document text
    • http://pivimufe.atwebpages.com/18773296469.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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 5200 bytes
SHA-256: 3ea507fb58a4da2f0de67c1bbf145b72b0b81d14e1a62529e32568d1f49bae6e
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 11064 bytes
SHA-256: 8d5748033ef005c536d1132ab68bdf5de1add8c5f00824843ef9f9a7f4f9b819

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