Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ea2a06abc21b14…

MALICIOUS

PDF

80.5 KB Created: 2021-05-08 22:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5df730af72972a97b05bd456b45d4565 SHA-1: adc616239536b4978cd4297453427d6893e59c44 SHA-256: b6ea2a06abc21b14a2b272e972bded435a5cb1c57516f589523b8f82bbb84c92
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing or malware distribution URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Coast guard safety requirements checklist', aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=coast+guard+safety+requirements+checklist
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/gokekoko.pdf
    • http://smartcreditscore.info/how_to_pair_2_jbl_partybox_100slez0.pdf
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/174367.pdf
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/b4c8f80.pdf
    • https://cdn.sqhk.co/vujuzira/fJygfu9/checkers_free_offline_multiplayer_games.pdf
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/rimaje_rasofelawewuvo_vorumoveveni.pdf
    • http://usacreditscore.info/is_thinkorswim_free_to_usewcw46.pdf
    • http://leoidet.xyz/98925629316gsuqq.pdf
    • https://cdn.sqhk.co/xetasenuwoji/7gjq8gj/commercial_property_rental_inspection_checklist_template.pdf
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/4761306.pdf
    • https://padawevuwelidas.weebly.com/uploads/1/3/1/4/131438111/gabet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_6a5e02fa69b94e51a93a092ad764eb2e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a9cf763-9d3a-4b4f-af22-deb58b35acec/87140401581.pdf
    • https://uploads.strikinglycdn.com/files/51013827-b297-409c-9566-aedbceb7e29e/is_silica_more_polar_than_acetone.pdf
    • https://uploads.strikinglycdn.com/files/cc475528-9401-478f-871c-1a6f4f38c8c2/how_to_turn_off_groupme_notifications_on_apple_watch.pdf
    • https://uploads.strikinglycdn.com/files/3fbe1315-071d-4369-b82c-c1d2ed757632/matibabubenilugugop.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_6d2db9300c1948e8adaec2759dd0b81f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78b8aeff-7d91-4e46-8af8-0e6d2306c6e9/romago.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_off0000ef7d.bin
9db4a54373ecb7bb8cc91f400f6d8bc20c404d0ae63c7633e62846f2e2734a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 5632 bytes
font_01_sfnt_off00010277.bin
a0ff5f577f8987b553fddce9fa4c0ff474b270729110f391ec964a517e6def04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10277 10564 bytes
font_02_sfnt_off000126b0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 4324 bytes

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