Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fc86ed77de835e…

MALICIOUS

PDF

74.0 KB Created: 2021-04-29 01:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba281dd9c91ca37b1a5788ab3103d5f5 SHA-1: 21a7185d474897d221e8f6f567b10bfbff2a7ea3 SHA-256: 40fc86ed77de835e3d9fd82351bb74b8aa4984fda3c360ed26efe91a4cf9a362
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs pointing to disposable domains, indicating a likely phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'success and motivation' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=best+books+on+success+and+motivation PDF link annotation
    • http://xofelivigavas.mywebcommunity.org/skin_cancer_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fcf0ed326cb4.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/zifagekogazubaparizuz.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/skf_thrust_roller_bearing_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_602c8c6e3be46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_600a21453775c.pdfIn PDF document text
    • http://nakozek.mypressonline.com/ms2_asphalt_mix_design_methods.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fd0989c1a764.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/ahggdgd/kaiser_permanente_urgent_care_baldwin_park_ca.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/sennheiser_rs_175_rf_wireless_headphones.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/29109098839.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/viwixojuvoz.pdfIn PDF document text
    • https://cdn.sqhk.co/takakakod/ejeYjjd/vijutojanukuromerepet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_604cb393851f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_602a3210b771f.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/ehbgcgc/80381557846.pdfIn PDF document text
    • http://lexaxak.mywebcommunity.org/piluvubewinor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fe2b6bb67929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxexopufo.epizy.com/ansiedad_y_depresion_durante_el_embarazo.pdfIn PDF document text
    • http://wiwedekepumepup.epizy.com/female_body_parts_name_with_picture.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 5272 bytes
SHA-256: a2193217fc6a18bee312e8685c2ea8bb1212053730c11cdc41386da488be94a4
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10384 bytes
SHA-256: 366a7bd88985ce0dd9aa2dfe04006b9017fe996a6040b5f4f72f6174b4686380

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