Malicious PDF — malware analysis report

Static analysis result for SHA-256 af27f34b0a12bb47…

MALICIOUS

PDF

74.3 KB Created: 2020-11-25 15:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 37d849f3c16c7f260f7caa12218ef204 SHA-1: bc1a637be8264503d52dfa2f9861a91440510f84 SHA-256: af27f34b0a12bb471a264359d13220142b2a782aae58a8de8bc1507a3a11ed0d
156 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 0.9998

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://traffking.ru/strik?utm_term=waring+pro+deep+fryer+df200 PDF link annotation
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/abc85f97664a1d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/digodivalupu-farekuwojoro-jowosukifafapon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_5fbe01b07f478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fa1a32324b3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_5fbb0711421ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5f99bbab75f2b.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/buxoparadazegu/the_glass_menagerie_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba59ff5-8ef3-4662-8ea6-5c904cf592a1/liste_des_verbes_faibles_en_allemand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d982284-49f7-4fa3-9a2b-fbd2a346061e/dnd_5e_xanathar27s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/wunojakukefivi.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/chrome_dark_model.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_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 5388 bytes
SHA-256: 0134d253fa83bdf55b471d89a654b1e95592b9b92789d5d433b788997733f01a
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 11036 bytes
SHA-256: d6f4cc308ad09039aa4418a3dfeb7a5954c281058298d4c5bc6c3e83a1c0c2c3