Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c34e5cc21bdedf1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-31 05:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76b9f817fc96a8decdb200bd5aa46445 SHA-1: 20618197ceb8704d4a0f9e84d7c989a91c4d19ef SHA-256: 1c34e5cc21bdedf1e3bf413b13804276f93fb2469cc65c47d334c8be3327b8a8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/award?keyword=xerostomia+review+pdf PDF link annotation
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/lukagamenorik.pdfIn PDF document text
    • http://sowopedasozax.22web.org/99279538235.pdfIn PDF document text
    • http://cuzinfo.ru/beranatopovegemupowaboxzur7p.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/mGjclha/tadixaloseduxen.pdfIn PDF document text
    • https://ramogowerutamu.weebly.com/uploads/1/3/4/4/134488443/5f7652575.pdfIn PDF document text
    • https://xurowileziruroz.weebly.com/uploads/1/3/4/6/134624378/fb1b07ebd62.pdfIn PDF document text
    • http://docita.fun/o_levels_biology_topical_past_papers322q1.pdfIn PDF document text
    • http://robefixelajimod.22web.org/buss_and_perry_aggression_scale.pdfIn PDF document text
    • http://raftgjgr.space/geratugexazjyn8.pdfIn PDF document text
    • https://wawawafux.weebly.com/uploads/1/3/4/8/134896626/62cb1c46ac6.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/353531.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/10c4d36bbd.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hrhfpsk/comic_reader_ipad_free.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/wegapufogoge.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/why_is_my_whirlpool_fridge_not_making_iceqkg0f.pdfIn PDF document text
    • https://kuzosilu.weebly.com/uploads/1/3/2/8/132815793/turonem.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/hjtBjet/notre_dame_2020_football_schedule_ireland.pdfIn PDF document text
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/e44ef34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rejoxudirux.epizy.com/7241600877.pdfIn PDF document text
    • http://vumafovixono.rf.gd/best_free_weather_alert_app_for_android.pdfIn PDF document text
    • http://dazewedoxagaxaz.epizy.com/list_of_descriptive_adjectives_az.pdfIn PDF document text
    • http://jenikov.epizy.com/27402413542.pdfIn PDF document text
    • http://rivapuremamoge.epizy.com/legis_actiones_derecho_romano.pdfIn 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_off0000eabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 5284 bytes
SHA-256: d9a0f21db19f5bfc4d964f44bb45d6ecf5e78e7053a98023adf11e8f04285270
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10984 bytes
SHA-256: 503615ca146b084c8a8f62faeced747f14b341cc716144d1db93a14ad7087c4e

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