Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc78b3f9cbcc0bd8…

MALICIOUS

PDF

82.5 KB Created: 2021-04-23 08:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cc43174f7ef50eca0135013831adadf8 SHA-1: 2dc660a44ef8b26e67789e6eaf26a5ffaa1126f6 SHA-256: fc78b3f9cbcc0bd8109ba4609c48237c6412526dfbf260f1ccb9fe21c99812b2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=how+to+get+pin+for+bluetooth+keyboard PDF link annotation
    • http://naturapple.space/zidaw0ub16.pdfIn PDF document text
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/5559153.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/a75108ad78f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_6065f77bcc5f9.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/5ZHI5Ac/tetuvivamegapapuwojofale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5ff84ebd01596.pdfIn PDF document text
    • http://polystate.ru/orbit_1_output_port_digital_hose_end_timer_manual0pik2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_601a08705771f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_605c2e031b46c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_600e52528da07.pdfIn PDF document text
    • http://reactivascotia2020.com/826908712664alif.pdfIn PDF document text
    • http://marketitaly.pro/school_uniforms_should_be_abolished_argumentative_essaygp6gb.pdfIn PDF document text
    • https://cdn.sqhk.co/kemuxilajig/ghjZuhd/geotrust_root_cert.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/hs2iigd/download_metal_soldier_titanium_mod_apk.pdfIn PDF document text
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/9103988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60246f40e1e77.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/cJhf2ig/naruto_x_boruto_ninja_voltage_for_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/aXjgeie/36057004632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_60579c265f6e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 5484 bytes
SHA-256: 675159abbf2eb185714ff17d4f9f6061f3ad4686caa48b0de39e800705717dd2
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 19344 bytes
SHA-256: a24159b20cab05da058c93bc29fc54dd7c88b651678f1bea5ce26363553e2b73

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