Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f5dc6732f84076…

MALICIOUS

PDF

81.8 KB Created: 2021-03-22 00:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 367f731f5af54214ddfd757730d87d45 SHA-1: 9e6d1651f44d87ab92605675961353a2d9b72239 SHA-256: 80f5dc6732f840768ad6b87ca95a9c7051984f1222629d013047c616d7afc371
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. This strongly suggests a phishing or malware distribution attempt, likely using spearphishing as an initial access vector. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=cbse+class+9+english+beehive+book+pdf PDF link annotation
    • http://tifoxikutawe.sportsontheweb.net/jopeturumufaperumi.pdfIn PDF document text
    • https://notojusuwetu.weebly.com/uploads/1/3/1/8/131871856/bezagulaxizeg_gutimileti_jalin.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/52736.pdfIn PDF document text
    • https://dorigobumin.weebly.com/uploads/1/3/1/3/131384291/ziwerezufiverow_nexetuwotezas.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/FQnxhir/avatar_full_movie_for_free.pdfIn PDF document text
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/bokogemobivurekefa.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/1753504.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/866c135fa485.pdfIn PDF document text
    • https://nezubarenegutel.weebly.com/uploads/1/3/0/7/130776328/2532542.pdfIn PDF document text
    • https://tewefoxik.weebly.com/uploads/1/3/4/8/134857012/6a7ec1.pdfIn PDF document text
    • http://pewujok.mypressonline.com/52456150060.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/2635259.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/ahejiaN/maxi_craft_exploration_master_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimimozoji.myartsonline.com/which_group_represents_stars_that_are_cool_and_dim.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_f70aa65c68624ff8b97a7f4bd592080c.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_03447922f3544e88ad2df67ec7b77d30.pdf?index=trueIn PDF document text
    • http://zezofakarol.myartsonline.com/alopecia_androgentica.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_1b28173b03d64361885de72f41565ef8.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c49bcc3bab0f4837b3becc8278d1d532.pdf?index=trueIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_01fafbd838cb49688254eecb353ce45f.pdf?index=trueIn 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_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 5648 bytes
SHA-256: 89a58360f1a33cb267c5cd0e6c4daade19cf41d0276b9d67976a0a3d85db4be7
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 10688 bytes
SHA-256: fc5aa683d72622f980b062c826cf3f9fbc6d27825da82f75123ecef3b24b246f