Malicious PDF — malware analysis report

Static analysis result for SHA-256 feae7282890ebcab…

MALICIOUS

PDF

77.4 KB Created: 2021-05-06 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5bdd788c41292db6afbba1e5f2c314 SHA-1: 7d2e646741769303b69bc5f3c60e8b865f360a5b SHA-256: feae7282890ebcab716011d8198a041ec902a8528a2102d9c9d05b044aefadd7
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a disposable domain, identified as a link farm by heuristics. The document body, though heavily obfuscated, suggests a lure related to 'Army pistol qualification'. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=army+pistol+qualification
    • https://cdn-cms.f-static.net/uploads/4484995/normal_60668a4e59b22.pdf
    • http://cashbackmoney.info/implosion_never_lose_hope_mod_apk_moneyl4ixa.pdf
    • http://copyright-security-ig.com/the_castle_of_otranto_sparknotes_chapter_1bubo5.pdf
    • http://tryadasert.online/para_que_es_importante_el_diccionario7g2ya.pdf
    • https://cdn-cms.f-static.net/uploads/4450257/normal_6056f12d54fd8.pdf
    • http://sentytld.online/starcraft_vinyl_bundle5917i.pdf
    • https://cdn-cms.f-static.net/uploads/4460449/normal_5fe7891d428b3.pdf
    • http://vannabanyavsedela.xyz/febevosilaxonaxivegofexbxpif.pdf
    • http://parkji5x.xyz/what_is_a_split_sentence_in_grammaryibpv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tugabijenovili/wavudupabujelubaretodifop.pdf
    • https://s3.amazonaws.com/toliwudalamem/57667285872.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_dd9368d959564da6825d67e5db97adcd.pdf?index=true
    • https://s3.amazonaws.com/pirosisob/choosing_a_medigap_policy_guide_2019.pdf
    • https://s3.amazonaws.com/xamibudasagas/is_there_another_way_to_charge_a_kindle_fire.pdf
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_c9032b2d6269446e8f4c3e557a8a9bca.pdf?index=true
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_2d04ca9e1d9641c29d46b340247dc581.pdf?index=true
    • https://s3.amazonaws.com/jiguwuzobozobaz/gatupajigef.pdf
    • https://s3.amazonaws.com/rufonali/kozukuxofiba.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_off0000f20e.bin
f5441ddc3d09d2fb4d2dd28600a0a0bf37e0b219e2bff5d745dd5fde565d451e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 5380 bytes
font_01_sfnt_off00010450.bin
b439ad2a9e14308168beccf21e03a860cdd5642aa1e12421b2545dc5e6968500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 10692 bytes

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