Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac5b67059f3f2eb…

MALICIOUS

PDF

66.9 KB Created: 2021-03-29 07:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c5dc35742dad4d42c086fc5b48d2cbaa SHA-1: e477abd7753f279bdea49fdd03946c25f1ee1125 SHA-256: 1ac5b67059f3f2eb050196f77cce67c888cdfb92c0b9297ee175870e30183084
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://xajibur.ru/123?utm_term=innovation+2020+progress+report', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

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://xajibur.ru/123?utm_term=innovation+2020+progress+report PDF link annotation
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/pipoxudodibox.pdfIn PDF document text
    • https://nepajomawowezuw.weebly.com/uploads/1/3/4/4/134462508/dubukipik.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/e9A0ges/railroad_crossing_mania_ultimate_train_simulator_2018.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/dexoro.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/competing_interests_scientific_reports.pdfIn PDF document text
    • https://woxamaxepid.weebly.com/uploads/1/3/0/7/130776503/25b2d1a5.pdfIn PDF document text
    • https://tiporedoxuva.weebly.com/uploads/1/3/0/7/130740235/xoboxisavoxakajoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jvhcxZF/darirurig.pdfIn PDF document text
    • https://tenuwikenosex.weebly.com/uploads/1/3/6/0/136082269/tapufidunezilolikab.pdfIn PDF document text
    • http://vabodulesofife.22web.org/9462223395.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/3hcjahd/kung_fu_panda_3_cast_mei_mei.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/igN6ghU/bad_2_bad_extinction_mod_apk_free_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/KFihics/monepujikurarewekinon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4f489e-8bd0-4c03-8652-2bb308a9189e/5096393494.pdfIn PDF document text
    • http://jetumodegupejit.rf.gd/adventure_offline_games_for_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d469bff-854c-47c3-87d7-dcda56d1b5fb/interesting_aa_meeting_topics.pdfIn PDF document text
    • http://foxoxamaxanibi.epizy.com/vernier_caliper_mitutoyo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a130a4fa-13a1-4bf7-8305-47e3a0c2b25b/62998455267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976e2d1f-3aec-4946-a401-ca0baa79a9b0/3973777590.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 5228 bytes
SHA-256: 9690d24fb956f2d7d3baa8153c6c1ee2f1504804a69fc8a706eae3c3f7500225
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10352 bytes
SHA-256: 18441983b451fe6804f3888408fc1f344895c0728e9ad80e5e605cfe530280ba