Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03083e9aeba418e…

MALICIOUS

PDF

75.7 KB Created: 2021-01-06 01:30:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05d56ddfbaa1fb83dc9c76fb1e2b6cb SHA-1: 161d162aefe9aee809ffd692146a55adc682b64f SHA-256: f03083e9aeba418e9890ef7f71d48bb21646287f9604984250c20a065745f280
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics 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 redirection scheme. The document body, though partially corrupted, contains text related to a makeup tutorial, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://traffset.ru/123?utm_term=unleash+your+inner+artist+makeup+tutorial
    • https://tofoboloronu.weebly.com/uploads/1/3/1/6/131636632/a1f9d5be.pdf
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/lejerukedazot-vinikamedur.pdf
    • https://cdn.sqhk.co/sukurorezib/ifSjbif/advertising_agency_jobs_miami.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/debexosaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5fbf4f5508be9.pdf
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/tudabelopotun.pdf
    • https://tegawaniro.weebly.com/uploads/1/3/4/3/134330557/nagip-nozuxuw.pdf
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fa81b9907013.pdf
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/c85d67634c25b5.pdf
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5fe0ecd66c937.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5df3478a-dff1-494c-9160-815fb8946ed5/ruzolutewi.pdf
    • https://uploads.strikinglycdn.com/files/b705366d-f838-4f80-a3ac-a8f27bcbc4d0/20003579498.pdf
    • https://s3.amazonaws.com/wudibirewuduto/78257024634.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_off0000eb40.bin
c55f26351a9dd084a798154444f0d86b9eb23885fd8a66969a4c7283db4136a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 5216 bytes
font_01_sfnt_off0000fcd7.bin
98161e6cb4ea028dae8de24fbc7b88d44fffb719e68ca2026ac4bff0efd566fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 11088 bytes

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