Malicious PDF — malware analysis report

Static analysis result for SHA-256 2713d1dc6b65e241…

MALICIOUS

PDF

66.5 KB Created: 2021-02-12 23:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 69c175f200758d178e86c9146574289d SHA-1: 953a2d158390f0727c058d1389b368bd97d6f739 SHA-256: 2713d1dc6b65e241a74cd64c7a6cd1ea1c9e8818cef7b23fcd4c4181cd2aa013
176 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or SEO poisoning attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics, along with the ML classification and ClamAV detection, strongly suggests malicious intent. The document's purpose appears to be to direct users to malicious sites or engage them in a callback scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=motorola+k7gmhbcj+instructions PDF link annotation
    • https://cdn.sqhk.co/vupapevixu/nCVjicu/monijovolonabajifipokiruv.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/A8ijhjm/moter.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/nebadoko.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/A3hbjbu/european_history_crash_course.pdfIn PDF document text
    • http://remumajisipiv.66ghz.com/dadagabog.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/pegek/kosolijegoxorebaratew.pdfIn PDF document text
    • http://bonizeza.epizy.com/manualidades_con_papel_faciles.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/fipowogirodupalozupavopu.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/legasijasurobakowikid.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/handwriting_letter_formation_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/brom_error_s_brom__da_fail_2004_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/gokewusififobaw.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_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 5580 bytes
SHA-256: c8b1922339060f8db7004db57e6847e2be83a70ad9c7b71ece9dd43bac6ad982
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10476 bytes
SHA-256: 5e3a9abe042e895114a86537541acdaf6f0030a87d292eee7b53283cbe6fe4ca

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