Malicious PDF — malware analysis report

Static analysis result for SHA-256 3159779075f8f751…

MALICIOUS

PDF

74.2 KB Created: 2021-01-18 00:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: af982a28b625e5422d82bddf67257597 SHA-1: b8cd1150a380f2bcd758f6f4fbcb55716cfbbd09 SHA-256: 3159779075f8f7518bc591b6ce877ac33ffb194c7df8f1d8e19c4e18a5ab1f85
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to computer hardware, likely as a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=4gb+ddr3+ram+204+pin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5f980ebf84839.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/hjigXgh/boomerang_movie_soundtrack_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f8cb1e9e8c51.pdfIn PDF document text
    • https://sivifarikajuleg.weebly.com/uploads/1/3/4/4/134487261/suwib.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/fasoxomojipusobonajefedav.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8712bba61a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_5fb40ecbcd275.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/ravodokanabevile.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/HgiUkD8/scrap_metal_rockdale_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5f985430ce804.pdfIn PDF document text
    • https://site-1195638.mozfiles.com/files/1195638/palazukefusule.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/jjgUqie/wejopaxepubez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_5f95653c3988f.pdfIn PDF document text
    • https://dapekedes.weebly.com/uploads/1/3/4/6/134643928/biwusivubizufijujeva.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/ethaGif/world_history_topics_before_1500.pdfIn PDF document text
    • https://site-1256394.mozfiles.com/files/1256394/bomizixexide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 5640 bytes
SHA-256: 5746d5732dbbcb212d12e55258add9f62dca7fc6c1af4e64fa6870ec176ec4c9
font_01_sfnt_off0000f80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80C 10404 bytes
SHA-256: 9f89c900c1e2ed6bb8fb14e1d65a3e9511500bdf321152465191136d6a1d4f52

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