Malicious PDF — malware analysis report

Static analysis result for SHA-256 406b183da6b3d4a8…

MALICIOUS

PDF

75.6 KB Created: 2021-01-22 14:57:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce34690a2c05de65ac5199a36691b4b5 SHA-1: de052fb552bacf709a6177475abe285e112ba069 SHA-256: 406b183da6b3d4a8463a38af6dfeb127e352bc0ed4e5560e46e9406b7e8f791c
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The presence of an embedded URL and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the phishing detection indicate a likely attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=outdoor+batting+cages+san+antonio
    • https://static.s123-cdn-static.com/uploads/4446776/normal_60048e0068d48.pdf
    • https://static.s123-cdn-static.com/uploads/4464862/normal_5fefbe32136b1.pdf
    • https://static.s123-cdn-static.com/uploads/4466140/normal_5fdda2b5baf5e.pdf
    • https://site-1167928.mozfiles.com/files/1167928/clash_of_clans_dragon_attack_th11.pdf
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fd056af96e34.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/9a44fd8.pdf
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/567439.pdf
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/ravomozuwid-sowis-roxasoketoz.pdf
    • https://site-1166670.mozfiles.com/files/1166670/wudezojivibabexinikibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorifumofelu/toolstation_core_drill_guide.pdf
    • https://s3.amazonaws.com/padadutiseni/lower_limb_bones_anatomy.pdf
    • https://s3.amazonaws.com/lomogas/19532920116.pdf
    • https://s3.amazonaws.com/pasutiz/amd_chipset_driver_windows_10.pdf
    • https://s3.amazonaws.com/wupixufekijax/97901391185.pdf
    • https://s3.amazonaws.com/mubemutolewe/ccna_1_chapter_11_exam_answers_v6.pdf
    • http://mekavebij.epizy.com/96871909923.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/seluwil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin
a702a58bcb65d3dfb7097d920316e93755b04da3c6eb7b1799cb045d24dd3e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5240 bytes
font_01_sfnt_off0000faa5.bin
5d8551cb43c1196bcf870acdaa34608505880b36241cb7715b644780562cdb80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 11324 bytes

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