Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb2813580aa0b2e…

MALICIOUS

PDF

69.8 KB Created: 2020-11-26 02:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7914c88d8cd49e34c7fc05bf59ae6c42 SHA-1: bb9d336668b9ebd6eb222418958176d2c369b2e7 SHA-256: adb2813580aa0b2ea2b685df917e45d6700e3a73901be2f753ad92a72e457aad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent URL pointing to 'trafffi.ru', suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially indicating its origin as a generated document for malicious purposes. No scripts were extracted, but the PDF structure itself facilitates the attack.

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
  • 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://trafffi.ru/strik?utm_term=lego+batman+beyond+gotham+free+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f90ee6e70015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8be3a7b22a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f890b9c61d18.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/2195442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f89073357e16.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/5501900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8feec5ce-63e2-410c-bdbb-2eba66d05d07/fegipilebijosaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/5160676182.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/guvojoxelekim.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/xatejifuxogugawexoraz.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/ginawimuwotofigugujavuka.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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 5280 bytes
SHA-256: 4f8cd1ea4c7194e774efc06ee7d5907e45afc72aa1a1e32ba7290a79a0b5fc6b
font_01_sfnt_off0000d352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD352 13532 bytes
SHA-256: 765532a1895aeb782b5fb44f0b4d2533581fa353056a2663030f35612e200b92
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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