Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37df414e8c95b24…

MALICIOUS

PDF

86.2 KB Created: 2021-04-19 02:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ca791ad4cf8771a981e9318f125e13 SHA-1: 6c986735217465f63692b135b59e9bdd7a24fecd SHA-256: d37df414e8c95b2468ceb629e781bb3f03be712c1f39673691f6ac7babe1af2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm attacks to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=low+cost+spay+and+neuter+mobile+clinic+near+me', are likely part of a phishing lure, disguised as information about a low-cost clinic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=low+cost+spay+and+neuter+mobile+clinic+near+me
    • https://cdn-cms.f-static.net/uploads/4423454/normal_60357e9289dfe.pdf
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/fagoderegujutimova.pdf
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/c4d9397107f.pdf
    • http://zoluwofemofuper.sportsontheweb.net/lowrance_elite_5_ti_fishfinder.pdf
    • https://xumefuzodagugud.weebly.com/uploads/1/3/1/3/131384373/legupopufuvibexuduzo.pdf
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/4ca17aa424f739.pdf
    • https://static.s123-cdn-static.com/uploads/4417308/normal_5fdcdfb4ea1dc.pdf
    • http://nabavawuzafurur.mygamesonline.org/lelewafotizun.pdf
    • http://xenalebosob.scienceontheweb.net/altium_designer_complete_tutorial.pdf
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/geragoma_vovasabaz_bapipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_8776584e9e0d40488fc4c54df87e329a.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_ac9eaf4a1ced49fea957b7f669a4634b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b7232871-c122-4293-828c-dc787cabbcb5/washington_redskins_stats_this_year.pdf
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_800eaf02b3ad4a33b1144501412cc7dc.pdf?index=true
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_365c594c126143558a2e62b91f264f14.pdf?index=true
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_9ac72ffd851c4dfca81708fd24f838bb.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_39e6954571ea4514b046dee4c70ffeff.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_794accecfa2d4782a3d7d4f8f7db42f4.pdf?index=true
    • http://pitigapevede.onlinewebshop.net/cuanto_m2_tiene_un_metro_cuadrado.pdf
    • https://af4bb04d-41a2-413c-b691-ce0a46ff998d.filesusr.com/ugd/e677f8_cc0b99ba1e384c68828e62680e7afba7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9e647968-53c8-47e6-bc2d-68c64ce92742/bepedoxap.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_off00011320.bin
acddcdff2f6e2c92a7ecb055981559e7f3ff6e08935410519470c86d7d577a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 5492 bytes
font_01_sfnt_off000125d0.bin
70ba1da2263caa2b139a9679a69e4d237fe5cab7845d3f6a96f2c1b9113de98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 11036 bytes

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