Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5c52cd501c7847…

MALICIOUS

PDF

75.1 KB Created: 2021-04-17 15:40:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2b929973cf77f624171d728abe881de9 SHA-1: c49807da24724bf087bf9ec0870f6c2328fd1907 SHA-256: fe5c52cd501c7847b71f1e8da0ed80d3ce3f4bc741d77e0282fbfead7ff28777
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, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Fender rumble 100 bass amp schematic', likely to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=fender+rumble+100+bass+amp+schematic PDF link annotation
    • https://cdn.sqhk.co/gidenateg/fypswha/27049545734.pdfIn PDF document text
    • https://cdn.sqhk.co/xunixenovapi/b0MPdlH/51220054061.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/wmehggi/51515954921.pdfIn PDF document text
    • http://7lessons.space/block_ads_on_your_android_phone360zf.pdfIn PDF document text
    • http://trikotoria.ru/paripohrzs2.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Cubhihi/hungry_piggy_vs_chicken.pdfIn PDF document text
    • http://matrixbicycles.com/arpanet_historiacs0ja.pdfIn PDF document text
    • http://makedctl.site/67468078225kngsp.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/duhdyjG/uno_tm_download.pdfIn PDF document text
    • http://women-ita.space/adverb_clause_worksheetsrrjtq.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/lolererijolesile.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/ieP5rid/65017296695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagadepepixapu.epizy.com/lovuseje.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_4e484325def74f6da39462944613d660.pdf?index=trueIn PDF document text
    • http://serepuzokoz.epizy.com/aoki_densetsu_shoot_batch_sub_indo.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_56329330e65d4ec7950883a37fce2dfa.pdf?index=trueIn PDF document text
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_6cadee1d57ef4686a5255a3cf5a1e876.pdf?index=trueIn PDF document text
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_ddc26dec1f3a48fb8e3bcebc177ab07f.pdf?index=trueIn PDF document text
    • http://vetuxularowuma.rf.gd/bizhub_c224e_administrator_password.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_45be484492304f868ea668995d51d118.pdf?index=trueIn PDF document text
    • http://witigegewujal.rf.gd/bitejetixinipif.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_off0000e482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 5604 bytes
SHA-256: 5d044e8c045974d9ee4f891e61c30fa1d128192ca770d0395dde17239f6389db
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 11116 bytes
SHA-256: 1fa499b6434c9eab2e9056d2749af7d9b9aedf4330e9324d634aa5de5b3d2f5f

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