Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8afefc53452a308…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 13:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1ed1edf1b79f6f3c39b09e9d291be4f1 SHA-1: 5c67c48336048b1ea886025a567597c6a804bc17 SHA-256: d8afefc53452a3086bdb2834187dd883badc3226035ea0823d2eeb241852affe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable or suspicious domains, indicating a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a product manual, likely to trick users into clicking the malicious links.

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://jacksth.ru/aws?utm_term=nostalgia+electrics+popcorn+maker+ofp501+manual PDF link annotation
    • http://itfamily.pro/64613844737xp8hn.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/pixasuxinexa.pdfIn PDF document text
    • http://ewop.space/50209521256585m5.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/zutitujez.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/c692fd4e1c956.pdfIn PDF document text
    • http://pevokepavaxe.iblogger.org/16424222698.pdfIn PDF document text
    • https://gukofatupov.weebly.com/uploads/1/3/1/0/131070505/petojeji.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/peralavewoxi-jogifogelegaw.pdfIn PDF document text
    • http://rodsfish.club/75793312422gplgt.pdfIn PDF document text
    • http://phrensy.co/best_android_wifi_booster_2018f17n7.pdfIn PDF document text
    • http://xasefosixojoloj.iblogger.org/forming_abs_plastic_sheet.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/fumiposamisur/stockholm_city_guide_design_sponge.pdfIn PDF document text
    • http://fixokofo.rf.gd/brinkmann_smokers_website.pdfIn PDF document text
    • http://xunonevikonog.rf.gd/work_experience_reference_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/design_sponge_city_guide_seattle.pdfIn PDF document text
    • http://ganusigesu.rf.gd/97262226886.pdfIn PDF document text
    • http://datidalumoz.rf.gd/bsc_modern_physics_notes.pdfIn PDF document text
    • http://dimebuturerab.epizy.com/mibexuzibuvip.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 5684 bytes
SHA-256: 81484faf2dde46b01771da76ac5e61d97f7ac0a12acf4845d9a8f8db04f4ef11
font_01_sfnt_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10724 bytes
SHA-256: 4461e8ab9cd16380510c656be1ef8a170c3b7821872bde3815b934b156c4e658

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