Malicious PDF — malware analysis report

Static analysis result for SHA-256 836488a11a44372e…

MALICIOUS

PDF

73.0 KB Created: 2021-02-21 23:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f61aa37bc82f772af07947e1291db40a SHA-1: 3497841c3ca7a3b0951c9caab5a33c8a936158b2 SHA-256: 836488a11a44372e7cfbb53b4c5544c0cf1b302bcd05dc1a2d71410881872b15
206 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful or deceptive content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://baarspo.ru/wb?keyword=equivalencia%20cucharadas%20gramos%20azucar PDF link annotation
    • https://cdn.sqhk.co/ketofebem/gf5RHij/qr_code_scanner_for_windows_10_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/ijegjhc/44801149537.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/xixawufenaxidegoxi.pdfIn PDF document text
    • http://xogiraj.iblogger.org/wuvegon.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/bb7jdgg/best_wordpress_themes_for_blogs.pdfIn PDF document text
    • https://cdn.sqhk.co/walekikem/gcja8dK/89019810195.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/xOtii7I/planet_star_wars_2015.pdfIn PDF document text
    • http://health-top.ru/82115212022hkxs4.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/8899dc8e563.pdfIn PDF document text
    • http://wisitens.online/describing_adjectives_listl1lyf.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/jopifodami.pdfIn PDF document text
    • http://zootime.store/slaughter_3_the_rebels_mod_apk_download8ouyw.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/hgPVooe/run_3_online_free.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/kovezux/57196175725.pdfIn PDF document text
    • http://fudinurozoxesa.rf.gd/what_is_culture_in_world_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/sch_let_s_learn_english_book_2.pdfIn PDF document text
    • http://tosebimujuted.epizy.com/xesofovere.pdfIn PDF document text
    • http://juvejuvikanu.epizy.com/15753411844.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/nesuzidimilit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD324 5548 bytes
SHA-256: c06000fc1be0b6c37a3444dc9f700a2b560210230edc1fb267b4d6cd9aa008dd
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 11772 bytes
SHA-256: a22ec96b070f19da307b1996650c32e2625ea92cc5fd9280bc80d292e7eab42d

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