Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3344b413cb082f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-11 19:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 152fa1960f34d37bace92cd2747aa698 SHA-1: 0e8783736ef3f7375d8a3fc80a7499efca54d048 SHA-256: 2a3344b413cb082f5d6849c340d3e22b1bbc818ef6c4cf439092000c731858ec
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://xezojetit.ru/wix?keyword=rubbermaid+cooler+parts+accessories PDF link annotation
    • https://cdn.sqhk.co/fapewejav/GLjhnic/mystic_vale_havens_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/eyhUrjd/social_media_marketing_jobs_meaning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5fe5b3f43dbdc.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/lugorug.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/mhfiHtO/black_ops_swat_offline_action_games_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/hfliigd/rugby_world_cup_2015_trophy_guide.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/bobigiparis-luvubiveku.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/echgicY/little_heroes_1999_full_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf5cf71000.pdfIn PDF document text
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/juburazib-kumofadojafana.pdfIn PDF document text
    • https://kiledakod.weebly.com/uploads/1/3/5/3/135385809/8018c0cdfd4e7.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/bodafimepu-vugigozosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_878ab610237a4cd584d71447287692d5.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_178a4ab0ba3644a8b30d188a45dc6efa.pdf?index=trueIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_b6a19036d9d94a7ea17d470c4a9abec1.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_bc2c096f0fa64aeeab310b0b94c0c1ea.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_a35793c0af58413ebebac8665f18cfac.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_badc05b2caf645d0a9bb112f0e43917b.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_aa023c2f7cd84531b715c119852b62db.pdf?index=trueIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_a5e781d615314480b516e9f24317b74c.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_37b7db85ee41455c8ca38db912c094f3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5140 bytes
SHA-256: 26d5712faccea8a0874d06ddfae11fb4fefac4871d605e688cb4b23b9358c56b
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10096 bytes
SHA-256: 25e152066df34003a3b8e82cd3b5364d655783d4728545b52bccffe7c5686b94
font_02_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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