Malicious PDF — malware analysis report

Static analysis result for SHA-256 5631ad27ac4e6569…

MALICIOUS

PDF

72.6 KB Created: 2021-04-04 15:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afdf68ded8e7064abcabf17f1fdafc6d SHA-1: 7d162dc42a14548fa2013ce32e671c5dba59e5fd SHA-256: 5631ad27ac4e6569b7933dec408ed3f9f3fca6b194b822388c6ba6235b5bfa4e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=aquaclear+contacts+base+curve
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/sexizemezekoseb.pdf
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/7730580.pdf
    • https://cdn.sqhk.co/mojuzizimu/scjabif/playbox_apk_firestick.pdf
    • https://cdn.sqhk.co/dinigivo/jihcwaK/rakeridilukatowubevo.pdf
    • http://xirijapip.mypressonline.com/duleniv.pdf
    • http://pidusejop.medianewsonline.com/ashby_v_white_case.pdf
    • https://volamajujidek.weebly.com/uploads/1/3/4/6/134667755/wupejonuziguzunaz.pdf
    • http://zonitupupafof.sportsontheweb.net/goxogiluliriradamumewowif.pdf
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/62ad2e6c079c1.pdf
    • http://lixodamevurobar.mygamesonline.org/advanced_materials_technology.pdf
    • https://sufidubiziden.weebly.com/uploads/1/3/4/7/134732268/2124374.pdf
    • http://sowopezamiw.medianewsonline.com/32465911237.pdf
    • https://rejifiri.weebly.com/uploads/1/3/1/3/131380436/zuvetomepigofan.pdf
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/bereriger_gavasikowepez.pdf
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/c04440.pdf
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/6002781.pdf
    • http://vuzuwul.getenjoyment.net/facial_asymmetry_treatment.pdf
    • http://mupifojoxur.medianewsonline.com/pleural_fluid_cytology.pdf
    • http://mumolazesinidix.getenjoyment.net/area_of_regular_polygons_worksheet_2_answer_key.pdf
    • http://tivuximuliku.mygamesonline.org/mojamopano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://defakulid.atwebpages.com/honda_civic_2012_auto_shopping_curitiba.pdf
    • http://jusopetikikij.onlinewebshop.net/74188768210.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_off0000dc2e.bin
77a2cd0119612370341fa69a283eca9abaeff36998614c90660342d1f8d1f0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 5108 bytes
font_01_sfnt_off0000eda7.bin
f77b4240f23476219e585ad66c10fc0b691750de45b6a1bc2f2e100228622f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 11684 bytes

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