Malicious PDF — malware analysis report

Static analysis result for SHA-256 2687adffc77816cd…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 12:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0043e0a5fd5a3735daf2065d106ddaec SHA-1: 5d773a0f01b0cabdfca67ba1597cede38d7f9f50 SHA-256: 2687adffc77816cd79f58bafceebc9a4f928871c53b13e1a03b78110884a1f34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

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://leonvi.ru/123?utm_term=how+to+make+your+own+diy+face+mask PDF link annotation
    • http://belplitka.ru/jimudowamumutohcncu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428054/normal_600150f152590.pdfIn PDF document text
    • http://bigops.fun/project_management_budget_tracker_templaterdb1s.pdfIn PDF document text
    • http://load-bcp.com/vojefokuzinosevunenubiffsqn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_6008f07f74b2a.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/dikad_gajumir_sulepebetezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6029b23704db6.pdfIn PDF document text
    • https://zadujogor.weebly.com/uploads/1/3/1/4/131406982/kalamekibube.pdfIn PDF document text
    • http://bankrot-biznes.ru/77810854604cu93v.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/baxekojojexusol/nuwapupobuzumiseze.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/beauty_and_the_beast_disney_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/flyer_templates_free_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/messenger_lite_latest_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/sojusetasaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/16596223083.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5356 bytes
SHA-256: a5f4c03bd7a385de270f62a9f6bd304ea849ca5e740dd58a439659fa83e1b69f
font_01_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 10628 bytes
SHA-256: 8cd459aa773527e86895047a91708429a4d03e0f3c935cd5f4494ea53b6519b2

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