Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e9313ffb09dd6b…

MALICIOUS

PDF

72.2 KB Created: 2021-04-27 14:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6496202514a080ee3cfa27fb5dc52126 SHA-1: 703e57b1fa26471d71789eaa2d99e6d309f9c1b2 SHA-256: 20e9313ffb09dd6be1dcee02745263dcf61d0b122fbc10c03d5323916d3fddfb
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://soxebez.ru/strik?utm_term=rational+male+audiobook PDF link annotation
    • https://cdn.sqhk.co/rosisole/Yjfrk2P/racing._com_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/fDiahgi/chop_chop_slide_song.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Phjjchd/nenazovulur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449184/normal_60391965737b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465559/normal_5fd78d369aae4.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/60609816745.pdfIn PDF document text
    • https://cdn.sqhk.co/mumepefofise/GQgiQrk/alone_movie_480p.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/CkiiaeP/masha_and_the_bear_birthday_invitation.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/geLpShG/61000191425.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/hihdjgD/nenuzaxaxagodigenowexolad.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/hPifjg3/labyrinth_of_refrain_review.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/lituwikigikasexalakukus.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/Vijil3C/dead_island_free_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/whiUqdh/ping_pong_table_top_for_pool_table_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_4d326dfccc044b3ba8fc80f217771f8d.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_e03b6a5bfecd4059a9c02656f08037a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wulagisi/62717889686.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/3261120163.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/xekotumetuxuv.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_2e4c685afa794d8392a5b2282a08d3df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/new_language_leader_intermediate_workbook_answer_key.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_6fcfe36f895144d59a7cbca12ca0367b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 4908 bytes
SHA-256: 5bef75aac11c6f956566f380f4bb35eebd95aecd5fbc39d533a377c781c91ad4
font_01_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 12156 bytes
SHA-256: dc3222c86ec771252d9ff6c40a86197cbdb0ae0633b01d08fda22c5eb8a94d74