Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfe0c987b958b6d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 13:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a93d60295e537f4f9859daa641e30f91 SHA-1: 0419c4cbd22c1df0337ee74220883eaf2b5eaabf SHA-256: edfe0c987b958b6d269923e18557e690f1beace307c1a9314db677606a0ddff9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to an 'evacuation mock drill report', likely a pretext to drive users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=evacuation+mock+drill+report
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/vininedabelam.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/narezaka-sobubeze.pdf
    • https://cdn.sqhk.co/jotenitix/oGfi4jd/siwekusiwopefis.pdf
    • https://cdn.sqhk.co/bekutojeke/phgI0aH/ponam.pdf
    • https://cdn-cms.f-static.net/uploads/4449984/normal_601ed8763729f.pdf
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/3986256.pdf
    • https://cdn.sqhk.co/libodinidep/9Wfjh5c/white_tripod_dining_table.pdf
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fc9dbb21f3bc.pdf
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/4938346.pdf
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fe6411d7fff7.pdf
    • https://cdn-cms.f-static.net/uploads/4374013/normal_602a8700ea8a3.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/516f9230f11ea.pdf
    • https://cdn-cms.f-static.net/uploads/4474231/normal_601a9e5a7fd91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_18875138c2c844d9afae4fbc89454b65.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84dc7e95-6847-41f4-8f2c-11e7b303feb7/61513603348.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_cf1455ab43d9483486dca0b9ace33b6f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/637434f2-91ec-4864-a9b4-e7d254e96f88/swingline_heavy_duty_stapler_how_to_replace_staples.pdf
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_a6bf95fc19294e99b582f4288854bb83.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_4786a64533b745328323bc3ce48c5f5f.pdf?index=true
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_5be1062eefb04cb99e3c80cf91ba8612.pdf?index=true
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_69512fad5f2f4e33b90ee0615159607e.pdf?index=true
    • 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_off0000e55c.bin
a75139063be6ef69c8f394b4dfaf536349b514a3a3c7097c3be555acb4b14dd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 5120 bytes
font_01_sfnt_off0000f6bc.bin
b2c81446aaa0fc676214474b1e3494b5d173fa528c0db66b3e285e47befac693		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10464 bytes

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