Malicious PDF — malware analysis report

Static analysis result for SHA-256 181b6ee65ae6fea1…

MALICIOUS

PDF

70.1 KB Created: 2021-04-04 08:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ee4c1b4d55ac04b78c1459fa46869e02 SHA-1: fa25de9bba2f20412c4a03219bce4e396372e9cb SHA-256: 181b6ee65ae6fea135d242b6421a5e0eae4045369f6357dfc3b086319e14a396
206 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://golowaki.ru/wix?keyword=myspanishlab+answers+chapter+5 PDF link annotation
    • http://pukitifafizeba.mywebcommunity.org/2020_cadillac_escalade_repair_manual.pdfIn PDF document text
    • https://girakojazesu.weebly.com/uploads/1/3/4/6/134675992/4086581.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/d4ae87eaf0.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/VShcjaS/pemikudebu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/iDgeUIn/wavisebogopuzitivi.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/hegdjha/7_wonders_duel_rules_pantheon.pdfIn PDF document text
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/nemuzodelojiso.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/8ggkphg/nogotijafovam.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/kuvatexekunozasexafe.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/jiUiixe/guilty_gear_strive_ramlethal.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jahejcY/bird_of_paradise_indoor_plant_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/cXFgiI3/luvugex.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/jipoxofitol.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/iZw5xIH/81058264322.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/5077022883.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/iirjdwy/28930585638.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/bokelur/fepenoxemabowowufe.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/why_engine_service_soon_light_is_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4c78eb-1e32-4616-9531-759992e1218c/why_is_arterial_blood_gas_test_done.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e75029-a531-4146-bd7f-79c0c87470fd/woxevitonemaxafipinaximo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cf22c0-a890-4fad-93cc-36b19b746b34/61944537589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e097cb01-f317-49a5-9165-7b5c66ba9ba6/jigexeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc03573-f23d-427e-bfde-1048d24dbd4e/61137816511.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/23444172734.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/asterix_all_comics.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/tower_defense_android_free.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_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 5484 bytes
SHA-256: 87b23b82391e627053c6e5b39bdf324b4bc86c874e89079624928773a8bacce4
font_01_sfnt_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 11160 bytes
SHA-256: 7816939147fbefd967b59cb0336777cafa24c5223901439e80239bd8c70b7099