Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f22788cc51885b…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 11:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6a7a0835e7a2fcedba72b9676e7c545 SHA-1: 7f8a4c2ad17fbfaf14777e2caa4bf3877e78335f SHA-256: 40f22788cc51885b45caf8fb21cf190c86bcb99eb75776ddd96f4e6c3ae50e4c
166 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

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
  • 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
  • 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://jumiwimov.ru/award?keyword=tomy+autoclave+es+315+pdf
    • http://ledozikatiresev.scienceontheweb.net/samsung_tv_remote_programming.pdf
    • https://lazimepirurela.weebly.com/uploads/1/3/5/3/135350713/4744154.pdf
    • https://zufuvedowenekoz.weebly.com/uploads/1/3/4/8/134861022/4dc72aa678c.pdf
    • https://static.s123-cdn-static.com/uploads/4389794/normal_5fd09166d56b8.pdf
    • https://cdn-cms.f-static.net/uploads/4486368/normal_602712fc70e97.pdf
    • https://static.s123-cdn-static.com/uploads/4454182/normal_5ffc0209c79dd.pdf
    • http://pefiworawodud.mypressonline.com/85406422611.pdf
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fdf31290a62b.pdf
    • https://cdn-cms.f-static.net/uploads/4472501/normal_601cf4a4be67c.pdf
    • https://cdn-cms.f-static.net/uploads/4490367/normal_605351c85790e.pdf
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5fdbcc6d72df1.pdf
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fe88c653ca60.pdf
    • http://bufibinokurun.scienceontheweb.net/90044148355.pdf
    • http://najetaxu.mygamesonline.org/unspoken_feelings_of_a_gentleman_ii_pierre_a_jeanty.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kipejefanowisu.atwebpages.com/what_is_the_definition_of_reflective_writing.pdf
    • http://zujixelobukife.rf.gd/causas_y_consecuencias_del_acoso_escolar.pdf
    • http://suxudogakol.myartsonline.com/zamutuwiwaxeditudikes.pdf
    • http://susebuxusebug.epizy.com/58786917063.pdf
    • http://releboxodaw.rf.gd/besaxifuvube.pdf
    • http://turijebudeta.rf.gd/youth_soccer_strength_and_conditioning_program.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea12.bin
0d6da2bfac219f1422fa6e13fbbc244a6c1eab299da6133b69f0d9de5a081a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5384 bytes
font_01_sfnt_off0000fc85.bin
94e0c4ff26c277d39d3fead7485a1443e81f0db600af77e953cc1848a361b7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11292 bytes
font_02_sfnt_off00012334.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 4324 bytes

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