Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4668a12a58c0acf…

MALICIOUS

PDF

103.6 KB Created: 2021-01-08 16:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2867547872f0b2de2488ce1fea250462 SHA-1: 70c528494142e261ad7dda498cfed9778b682485 SHA-256: a4668a12a58c0acf6e5d4956ef42ee47489f579a572e5eefd66b765ab9dce0ec
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to redirector infrastructure and link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the document structure itself is designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=anne+shirley+series+free In PDF document text
    • https://cdn.sqhk.co/zosikoto/TrHVxH0/37187087896.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/jicbzhg/tubeboxinef.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/jjahaec/51049681799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5f9585dd84146.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/etrgjYS/59834371893.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/1742597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8a907fe0706.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/zabevog/89563439235.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/overstreet_price_guide_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/39067573068.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/66518960006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67dae443-5788-4d22-8516-eb3e55e0dac4/connecticut_river_valley_killer_unsolved_mysteries.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/conceptual_physics_12th_edition_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 7324 bytes
SHA-256: cfa23ccf64fb4d0630a8a3579a9a40d9f12990c1446bd7425af7c3fe4cb81c99
font_01_sfnt_off00015b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B07 4736 bytes
SHA-256: 7459af348f9d974aedda5c60dfe9581fc779bf0525a4144928e387bc1cc7c77f
font_02_sfnt_off00016b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B24 11352 bytes
SHA-256: b817c18e4577b57168d160b33b87310391196f2c547f547bcb734b08a0d22570

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