Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4001d1cd987949…

MALICIOUS

PDF

76.1 KB Created: 2021-04-03 14:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0670221e9dee202a14a8fb1acab4637 SHA-1: af80ff1c31070c73d1f5394ffcf0c01aae7da4d0 SHA-256: 3b4001d1cd987949cdbb5448e2107a1aac1337a6df0b70f2e33076e789ca2cd3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary malicious URL observed is https://gimoguvi.ru/award?keyword=hernia+inguinalis+strangulata+pdf. While no scripts were extracted, the structure and numerous external links suggest a phishing or SEO manipulation tactic, potentially leading to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://gimoguvi.ru/award?keyword=hernia+inguinalis+strangulata+pdf
    • https://cdn-cms.f-static.net/uploads/4451377/normal_60443aded0400.pdf
    • http://mekujoviwe.mypressonline.com/79222033847.pdf
    • https://cdn-cms.f-static.net/uploads/4385026/normal_6011524ca7ef7.pdf
    • http://mezazasakejel.iblogger.org/algorithms_in_c_parts_1_4_download.pdf
    • http://maxoranano.sportsontheweb.net/hampton_bay_ceiling_fan_remote_uc7083t_not_working.pdf
    • https://cdn-cms.f-static.net/uploads/4451941/normal_60508f08a8e63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/redegelesibif/will_winchester_model_12_slam_fire.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_16588daafd0e454b9f43df8f04b83357.pdf?index=true
    • https://s3.amazonaws.com/wobuzisibal/10453283046.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_29e0e866e1904dcfa20cfd76dd5a3e65.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_df941f7e4b1e4ff783c13a426a97e6fb.pdf?index=true
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_a4c34f6f17d341c8beda1a90286283eb.pdf?index=true
    • https://s3.amazonaws.com/wetevali/paxomoji.pdf
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_0a115cac676c487180737ec2b678b99b.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_ca3b2d11aeed42b28166d8d1e1576e0b.pdf?index=true
    • http://xazopufegi.onlinewebshop.net/applied_mathematics_volume_2.pdf
    • http://lewomunenuvi.myartsonline.com/28077513488.pdf
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_57b6818089404f10b6b1d17d1fb7e8b7.pdf?index=true
    • https://s3.amazonaws.com/sagotomagin/el_conde_lucanor_cuento_37_resumen.pdf
    • http://kapetevik.epizy.com/gosowem.pdf
    • http://zisepuz.rf.gd/gre_analytical_writing_samples.pdf
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_711761240976497384e160bd8140bcf1.pdf?index=true
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_8c0ddb5cb22c4eb1bc880a3a89dbc73c.pdf?index=true
    • 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_off0000ec18.bin
6ad901442314c146e2f97990394c5a30b61933a1bf1ee32f786fd1af7c8fc0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 5172 bytes
font_01_sfnt_off0000fdbf.bin
3b0bdb8486424e03e8427fd569b1909046725c19ed0738347ab598379a4f1707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 11028 bytes

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