Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bf3f9e379a0421…

MALICIOUS

PDF

84.6 KB Created: 2021-03-20 06:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de5247a304d943d726b2349e415ee437 SHA-1: 66626ea1fd109dabebc5fae478a7033c58d998a5 SHA-256: c9bf3f9e379a04211eca0a623c424a092c8ee778ee695726bb3d82aa046e9ffb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=igf-1+lr3+cutting+cycle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464877/normal_60510430b7beb.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/dutoxolomevaburu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_5fe8d82113558.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/jadiwal_metemip_xufifezabaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60111429c8a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_603345a011d73.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/tudepigibom-nebuvoxivix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527164/normal_5fc8ae917b70a.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/best_aeron_alternative.pdfIn PDF document text
    • https://wuliwedifa.weebly.com/uploads/1/3/4/7/134753749/773d719ab92f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_600e0644c0573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fd681627417a.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/9641523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fe2c1524975c.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/9664968800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_6019c825c82b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60157cf034058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_6054c0b3b746e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fca744cba981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_5fd3274137404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6023d59e3a4e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/foneniz/13502875388.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/79578149648.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/believer_mp4_song_starmusiq.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/asus_rt-n12_3_in_1_router_setup.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/pivunomovikuka.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/fileboluwipumafidepub.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_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 4948 bytes
SHA-256: db69f889b9511d1f00189b3de335c0f86d787f658f4c0cf109ae2968c992ffc4
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 11364 bytes
SHA-256: c99c8a8dd25ca5bf24dd83007f90c136924510ffae254ef872de72ee4e9892da