Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afe61de979f4fdf…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 08:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65c7749db6684cfac26a73fb7eb81de2 SHA-1: a6db1fc8e34f5e77adf2e39eea535b454b9b4724 SHA-256: 8afe61de979f4fdf7a37fa28618f611d40d95205114092a3debb1543e1d23d4a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary URL being `https://seumenha.ru/wix?keyword=module+6+quiz+answer+key`. Heuristics indicate this is a link farm and ClamAV detected it as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`. The ML classifier also flagged it with high confidence. The sample likely serves as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=module+6+quiz+answer+key
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/soroxofonelilunugi.pdf
    • http://wewudiwiwojob.22web.org/47314226827.pdf
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/zamuretijesibi-fuzotoluxiv.pdf
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ffd0d773aa3d.pdf
    • http://cafe-cok.ru/22482399765xowmx.pdf
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/ca04d32cce6c7c4.pdf
    • http://universityru.fun/manual_de_bacteriologia_veterinariawffbi.pdf
    • https://nililuwuta.weebly.com/uploads/1/3/0/7/130775375/8592069.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5fd0e22aa2bd2.pdf
    • http://domexogod.22web.org/xatoragonobo.pdf
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/8872942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_e4b5bba556bd4cde9b6b7833b6f5c23c.pdf?index=true
    • http://dalapodomunok.epizy.com/72685251391.pdf
    • https://uploads.strikinglycdn.com/files/a66bed0c-f841-459f-a8e2-ac09268e173b/lafayette_economic_development_authority_jobs.pdf
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_15fc5b047a0041018863dc4f5b769e40.pdf?index=true
    • https://uploads.strikinglycdn.com/files/490d339c-49f9-417d-bbb4-5347bb2d5f48/dezolewuta.pdf
    • http://sekusasumoda.rf.gd/templates_and_inheritance_in_c_ppt.pdf
    • http://kegonen.rf.gd/amedspor_kaleci_formas.pdf
    • https://uploads.strikinglycdn.com/files/1cdb8c50-bd02-47aa-8bde-c5626f7f8aca/ktm_125_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/4cf52b38-2a84-493f-8a6e-4c2efc6cf6d9/24887265414.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001049a.bin
04f125acfd99e4d4ba87429fb402eedaf96ecfedb9fec99310477ca22e20413c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1049A 20804 bytes
font_00_sfnt_off0000cfbd.bin
f4e1e790567b6b990a28c7584232f140f2d876406041ba2f96cfd278a6c96d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 5412 bytes
font_01_sfnt_off0000e258.bin
1e2996448baea2a3362df8e451718221b3dece94ee341660720e6448c0ce26e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10532 bytes

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