Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1d305f98a50527…

MALICIOUS

PDF

71.4 KB Created: 2021-02-16 23:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dd5799c979cb1b79a1964de0a1468b22 SHA-1: 1bc4a17b412feae8a560313e4a89087d883640d3 SHA-256: ed1d305f98a505278250e7b066d7f057447c65ce9550fec0a3c4e46e7c056d6f
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF SEO link farm. It contains numerous external URIs, with a primary focus on `https://maypoin.ru/wix?keyword=rockspace+wifi+extender+setup`. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific content or embedded scripts. However, the presence of multiple external links suggests an attempt to redirect users to potentially malicious sites, aligning with spearphishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wix?keyword=rockspace+wifi+extender+setup PDF link annotation
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/4411749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469101/normal_5fec8dd111fc3.pdfIn PDF document text
    • http://card2card.live/friends_tamil_movie_templates52puj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_6019f0df165c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fe5eea605dad.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/4128761.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dujisuga.epizy.com/swanwick_primary_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/22089439213.pdfIn PDF document text
    • http://buxazub.epizy.com/sateju.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/jimefusuxododexovebin.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/80879359815.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/gasizus.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/tudute.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/61931253405.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/subject_and_predicate_worksheet_for_class_3.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/lexurikokejirak.pdfIn PDF document text
    • http://jijeledinevo.rf.gd/captain_crunch_crunchling_adventure_game_free.pdfIn PDF document text
    • http://ximifakapixe.epizy.com/double_bed_fitted_sheet_extra_deep.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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 5348 bytes
SHA-256: 9ab4664d8e79bb0bc0c1be5ef9408c79476f1f5fa00c1fea8516836faa889b3e
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10104 bytes
SHA-256: 1743d65e4c3f91ae3459b2dc52e69cd6c4a1206a6006f6b1e7ddcd778f71633b

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