Malicious PDF — malware analysis report

Static analysis result for SHA-256 631aee95c8d9a789…

MALICIOUS

PDF

75.0 KB Created: 2021-03-14 12:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a16221444600e38f7059f79ce5fcd5d SHA-1: b8c84c2134f2e6e4aaa4c58fc4725d6a1703305b SHA-256: 631aee95c8d9a78967f48aae2d62f194312355378b3a9dc57d4df23ed1f7e46a
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a 'Password-protected archive lure' heuristic, suggesting it's designed to trick users into believing they need a password to access content, likely to bypass security scanners. It also contains a significant number of external links, forming a link farm, with one prominent URL being https://lozipotod.ru/123?utm_term=free+password+keeper+template+printable, which is presented as a free password keeper template. This suggests the primary attack pattern is to disguise malicious content as a useful template to encourage downloads of further payloads from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/123?utm_term=free+password+keeper+template+printable
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/c2790.pdf
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/9756908.pdf
    • http://fufejezonodim.mywebcommunity.org/xevorekovimilurokerop.pdf
    • http://bopodimo.iblogger.org/18103812947.pdf
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/sosupafema-xirab-pafegofazimu.pdf
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/6275805.pdf
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/204506.pdf
    • http://rasudilikid.mywebcommunity.org/bruce_lee_greatest_movies.pdf
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/gubapojinebi.pdf
    • https://cdn-cms.f-static.net/uploads/4476007/normal_604cbb25c6279.pdf
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/df854dfd.pdf
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/6169923.pdf
    • https://cdn-cms.f-static.net/uploads/4388833/normal_602455fbd2038.pdf
    • https://suretilan.weebly.com/uploads/1/3/0/7/130738944/3274652.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5fe3b72fdb099.pdf
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/bewizugazebalegofem.pdf
    • https://mizazilat.weebly.com/uploads/1/3/4/5/134528341/bavexak-fazeba.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/48512fc5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavidatesudujig.epizy.com/asean_ict_masterplan_2020_full_form.pdf
    • http://mafonevaverazux.atwebpages.com/3367355296.pdf
    • http://laraduvusu.epizy.com/vuzuri.pdf
    • http://mepitar.atwebpages.com/what_is_article_2_about_in_the_constitution.pdf
    • http://gidiruroxab.rf.gd/battle_royale_film_free.pdf
    • http://verepuremi.rf.gd/kakan.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_off0000e8fa.bin
c3a09b1a8743ab319a8767d7a2b9e4669b28a8fa19e61b2638512e31db19b85c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5356 bytes
font_01_sfnt_off0000fb25.bin
75fb55e6d5ce2039346006055a00959ed53c19704008380505527e8a7683071c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 10292 bytes

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