Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a46f2e2247c58d0…

MALICIOUS

PDF

73.5 KB Created: 2021-01-05 01:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b4fd81a5b6fff759745e2236f7b48b46 SHA-1: e6bc85df2266e34850e67fd755cdf1c0f9b04e24 SHA-256: 3a46f2e2247c58d01001f010d48fcf1abfc2b4e75c0ec0b17cc120d5d2e00795
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous external URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document's content appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure.

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://traffset.ru/aws?utm_term=lagu+rohani+batak+bahasa+indonesia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f9c5a2eae08f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fce5f0cd2329.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/xgiVic9/zenavufina.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/eidr3Pz/netani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_5fb372b2d7746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fbe3528d1cf9.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/6929803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_5fc1311529b6f.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/tojabixefova/amharic_afaan_oromo_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0e738c-3260-4cb9-800b-616f148c9492/zefadudebelete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5426bb-3e17-4da3-b9e3-2b19e197f2f0/27681929023.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5200 bytes
SHA-256: 61f5375f3eba97b4aabf8bdbe3e305b70dc6148421bd08af6390740e646f538f
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 11144 bytes
SHA-256: 77738da098a486b12e0746f0177bb7da62ae842ea65dcfda2b1982994fd2697c

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