Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b554f594941362b…

MALICIOUS

PDF

72.7 KB Created: 2021-05-03 13:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a9c4f12dae37ff34fa63f00ccd960e7 SHA-1: 24cd1546765733fa6332acfef524523bc7b6e706 SHA-256: 7b554f594941362b8fabd56ac88b9ee45711ede05353ee58711b5aa6af8853a1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be related to product reviews, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=ilive+true+wireless+bluetooth+waterproof+earbuds+review
    • https://cdn-cms.f-static.net/uploads/4368492/normal_603596bc3df8a.pdf
    • http://korefubelexusiz.medianewsonline.com/mathematics_for_computer_science_solutions.pdf
    • https://cdn-cms.f-static.net/uploads/4470960/normal_602985c7dd313.pdf
    • http://newutatokulu.getenjoyment.net/verbal_ability_for_tcs.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/zedebojodetew_kipujupanikume_wipit_fuwan.pdf
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/vofafikoposix_goxudigi.pdf
    • http://tazanup.mypressonline.com/entrepreneurship_development_programme_syllabus.pdf
    • https://xapitutas.weebly.com/uploads/1/3/0/8/130813648/xegefizotuze_rojokenemepuk_lixiluxarar_naxek.pdf
    • http://xejepurefe.scienceontheweb.net/zemipakomajafoge.pdf
    • http://dikoxikikalonib.scienceontheweb.net/31124917696.pdf
    • http://resipowepo.getenjoyment.net/95683333301.pdf
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/4226624.pdf
    • https://silorofolukut.weebly.com/uploads/1/3/4/2/134265947/179967b3db615.pdf
    • http://nafarami.medianewsonline.com/24815093435.pdf
    • https://fumitalabojaluk.weebly.com/uploads/1/3/5/3/135399187/ladirofaza-tizowex-temedigirefa.pdf
    • https://gaxirakim.weebly.com/uploads/1/3/4/6/134605205/jajolotu.pdf
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/mimizopasugizag_xepibekatit_nowurumewi_tulene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vegubom.atwebpages.com/calendario_biodinamico_2020_espaa.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_off0000de82.bin
13f13b7986f68984a8ba0346df7db1f57c23689fdd190f5186b84fdbc470d05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 5356 bytes
font_01_sfnt_off0000f0c0.bin
01f324b7cd27d9f502dd36246419342225570136bfa3c896ef2d50d9944848d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 10652 bytes

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