Malicious PDF — malware analysis report

Static analysis result for SHA-256 87305710bf23cc44…

MALICIOUS

PDF

85.7 KB Created: 2021-05-12 21:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 475d6c8573c4f1d409a3748e5f3c9288 SHA-1: c87e5408d8d526492ac68212de66b151bf0b8350 SHA-256: 87305710bf23cc44622b0e6d8f03953d7efd9da5a31e687f4b29bc410065798a
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/strik?utm_term=jumperoo+rainforest+replacement+parts PDF link annotation
    • https://cdn.sqhk.co/fopikudapom/fvljhd4/space_core_galaxy_shooting_game.pdfIn PDF document text
    • http://xulorobunikoxu.22web.org/all_kinds_of_phobia.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/jiicljb/92040900636.pdfIn PDF document text
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/1573f5157323.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/bgumhaE/amazon_music_app_for_android_tv.pdfIn PDF document text
    • https://mijebekebune.weebly.com/uploads/1/3/4/0/134017127/jegaroxor.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/lezevadelure_noguna.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/OHjihe1/metal_bear_pack_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/Fhaifie/fab_t_mobile_app.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/ichdCXZ/muwenojetosevobefabajuno.pdfIn PDF document text
    • https://cdn.sqhk.co/kusukogan/m7Fgfjg/vedatiwux.pdfIn PDF document text
    • http://gosofejabe.iblogger.org/printable_party_invitations_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/dhhhiiM/79002857618.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/mifelokoxifumoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefugugis.epizy.com/zejuwikege.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_b5922281708f4308a1de6f438a9f341e.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_fa28529ed13649c28b8565001633ebe6.pdf?index=trueIn PDF document text
    • http://kowewewabozete.epizy.com/cancer_de_mama_medigraphic.pdfIn PDF document text
    • http://baxewape.myartsonline.com/gupegel.pdfIn PDF document text
    • http://wilafeduzavedew.epizy.com/97460612684.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_857469896b6e47818233f12fe6f3738e.pdf?index=trueIn PDF document text
    • http://wilosokanik.myartsonline.com/las_asignaturas_en_ingles_ejercicios.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_391480237710456989afe4f451065003.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 2996 bytes
SHA-256: a525018001ef6fe7802f4f70a80245b913604cf2acac0d377e4495efdc91a94f
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5152 bytes
SHA-256: da46287e26f6c4346e0f7ded53b9b8c36b6ac2980ac314cbbd79fa2a44617c89
font_02_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 12816 bytes
SHA-256: 6f309c551b691450324c4de4bd4dbc9e3dcb95fb4736619daf2c626005a1aad6
font_03_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16928 bytes
SHA-256: eb0923821c9b798fda9c0ae8f4d2e6c989e4c755775966864d077cdc62a32b2a

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