Malicious PDF — malware analysis report

Static analysis result for SHA-256 31896a6cbb6b2584…

MALICIOUS

PDF

79.3 KB Created: 2020-11-24 09:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56594f32e76ba46e5c8b0301b759104a SHA-1: 58d252a73245d4724acf5fe157d77080412046fd SHA-256: 31896a6cbb6b2584c1077ad19fd0696db64ba008fb2fa34867a9942b1f047633
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a phishing or SEO spam lure related to health supplements. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of many external links points to an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=garcinia+cambogia+results+without+exercise
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/xepezaxilisozu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/acb24ef0-462e-44c0-9f17-1d70aca4dd6e/gauss-jordan_elimination_example.pdf
    • https://s3.amazonaws.com/ritoma/gewofamuf.pdf
    • https://uploads.strikinglycdn.com/files/3624d685-612b-4787-a744-cfcdf299c791/76940125405.pdf
    • https://uploads.strikinglycdn.com/files/9eace156-6ab5-4404-ad21-ed951a99cb44/lugejeluxatesupixofemu.pdf
    • https://uploads.strikinglycdn.com/files/c1e282fe-a26a-4fd5-a372-deaf961d08a7/plant_vs_zombie_2_mod_apk_2.3.30.pdf
    • https://uploads.strikinglycdn.com/files/7ad4ab35-f622-4afb-9e35-65dc4e424dba/85250798535.pdf
    • https://uploads.strikinglycdn.com/files/04fab0f5-f382-4bde-9fa7-b60ef969c2fd/4254413521.pdf
    • https://s3.amazonaws.com/zerepuzuze/6551840868.pdf
    • https://s3.amazonaws.com/nelizenejakarug/35086091355.pdf
    • https://uploads.strikinglycdn.com/files/7c38f4a9-e8c8-4824-9910-76314b88f58d/iq_test_free_sample_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/c22a7eb1-be9a-4356-9050-76a3f7158182/call_of_duty_black_ops_3_walkthrough_youtube.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d833.bin
0014694a45f813ba51e90dd79a54ca7278885b442e63acd654077575772e9bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5544 bytes
font_01_sfnt_off0000eaf2.bin
c01c871a0a67b776f7ff2189631b2657ce7a3be0e85ff715c524bcce36c90a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 2148 bytes
font_02_sfnt_off0000f4e8.bin
8cc0b640b5dd06892fa236b6df7295d4fbbadf086748356c736696ed1555fcf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10724 bytes
font_03_sfnt_off000119d6.bin
967d89e51290aceb8fea09c2f9e0c707663cecf1a9b826b2128538f448fdbc28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16164 bytes

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