Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cae30877e8343e…

MALICIOUS

PDF

72.5 KB Created: 2021-03-31 23:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8414dcbc701b83987a6b543b3897435 SHA-1: d4ecf8ea3f7f5738dae203c426b7a7db2a56ba65 SHA-256: 27cae30877e8343e52ac99c736ca7f65cce1e0268f71e10f2962da6661526882
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, suggesting a link farm or SEO poisoning tactic. The presence of a specific URL related to a dryer sound issue, combined with the ML classifier and ClamAV detection, indicates a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

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://maypoin.ru/strik?utm_term=maytag+neptune+dryer+screeching+sound
    • http://fevevafo.medianewsonline.com/important_current_affairs_march_2020.pdf
    • http://rilomenininun.getenjoyment.net/acer_aspire_e5-571_specifications.pdf
    • https://cdn-cms.f-static.net/uploads/4476015/normal_6042e0bc211f5.pdf
    • https://bometisuvuxop.weebly.com/uploads/1/3/4/6/134684792/kifuvajuna.pdf
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/8145ba795bc1c.pdf
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/6649796.pdf
    • http://nosilekexiwot.mywebcommunity.org/bozitotatatavurup.pdf
    • http://wavobulowuxixi.22web.org/intrinsic_pathway_of_blood_coagulation.pdf
    • https://static.s123-cdn-static.com/uploads/4393785/normal_5febe0559dab5.pdf
    • https://cdn-cms.f-static.net/uploads/4457590/normal_600b67f61b659.pdf
    • https://rizogedimawe.weebly.com/uploads/1/3/0/7/130739598/e2cde729452c1dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kadinox.epizy.com/innovation_definition.pdf
    • https://uploads.strikinglycdn.com/files/c30a7e5d-feff-48c2-baa6-68bb9b7d5ef2/20439119437.pdf
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_83d3336abe214a98930019dcf9d806a0.pdf?index=true
    • http://zodejewab.epizy.com/tupelogitigatoritupukeru.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_3e06bbbacc8040428bc09464c9892d6e.pdf?index=true
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_34b2b944b2b94e048c0cea354b5d41c9.pdf?index=true
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_f32cf6e7ba4d4d40b6b55015d590dbce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6c1fa91-1de1-4ee2-ab50-feac1a18eedb/samsung_tv_remote_universal_codes.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_off0000ddd4.bin
c049fd7bdd71edb1dde6bb6e3c6936deda63e6a7ee953ab8ea91695030ba7690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 5408 bytes
font_01_sfnt_off0000f04b.bin
31894c6941db9ce129586f3583e9d7f2ca54165517c19daa8b5e6bb52f3225d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 10728 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.