Malicious PDF — malware analysis report

Static analysis result for SHA-256 c959adc9315a2d09…

MALICIOUS

PDF

71.4 KB Created: 2021-03-24 19:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e38e69c23b51d7d38ce9cb264704475 SHA-1: 2ef1e7b13374f0db395a1b5258b5060c2110e460 SHA-256: c959adc9315a2d0974d62dc05ebe4c617d261552f400428a6edcae71ec067304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are disguised as educational resources. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a network of links for SEO purposes, likely to drive traffic to malicious or scam websites. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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/award?keyword=adverbs+of+frequency+exercises+pdf+beginners
    • https://cdn-cms.f-static.net/uploads/4412584/normal_60593ac47a17a.pdf
    • https://cdn.sqhk.co/pelopuxi/nhgDNVO/best_porcelain_tiles_for_bathroom_floor.pdf
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5ff3dc269b442.pdf
    • https://cdn.sqhk.co/muwesisokim/gghhahd/5167267439.pdf
    • https://cdn.sqhk.co/vuzefoveniri/YOrPZI4/england_world_cup_penalty_shootout_2018.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_6030441e74c4a.pdf
    • https://cdn.sqhk.co/madeparev/BOjdYY5/dopejiweberar.pdf
    • https://cdn.sqhk.co/kifukuvitog/siejgeI/jurassic_survival_hack_apk_ios.pdf
    • https://static.s123-cdn-static.com/uploads/4500668/normal_5feec4ef54b23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_d06716bd9d5741588112d565bfd3a176.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_4c7273dfc7394a729f2756219054be2d.pdf?index=true
    • https://s3.amazonaws.com/diwitapezu/hdfc_securities_nps_form.pdf
    • http://toxukagaxopud.epizy.com/emirates_nbd_online_telegraphic_transfer_form.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_6757dd229154489e880eec86f8f47f1c.pdf?index=true
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_3c405b9778344e0eb9bb514bf18112c9.pdf?index=true
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_fa28b8fe7e90498cafd6167230638b86.pdf?index=true
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_8003ff41a30a498289ff04427006057c.pdf?index=true
    • http://lufefavi.epizy.com/kobex.pdf
    • https://s3.amazonaws.com/pesetufavo/74978207704.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_066fb87dbd02464aa772ee5cf0686540.pdf?index=true
    • http://jovuwumadileweb.rf.gd/52567818892.pdf
    • https://s3.amazonaws.com/feseni/94274897933.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_5bb99550bec54b9f8bd7640ca46fb161.pdf?index=true
    • 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_off0000d855.bin
99f17133734f56868d9b83e8416b647a5f7357413cc01fd6da86e9c8502e2599		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 5568 bytes
font_01_sfnt_off0000eb5b.bin
903268d91337ce9d899bcf1472c59050dd556de542b29ca7584b6aa49d17d30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10716 bytes

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