Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9974523e1628077…

MALICIOUS

PDF

72.2 KB Created: 2021-03-08 23:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d97e3ab1554ee698fe7626a9009b5f24 SHA-1: 103900052617f117a70c601f4d4871348618c37e SHA-256: c9974523e1628077624dae1bf1d9d6c5e5faedf6e759213d8f3b100050a79b94
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/123?utm_term=batman+begins+corynorhinus+piano+sheet+music PDF link annotation
    • https://cdn.sqhk.co/sizozizaj/QihfBja/anime_cat_whisper_of_the_heart.pdfIn PDF document text
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/7532647.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/5hfVIif/cute_free_ringtones_for_iphone.pdfIn PDF document text
    • http://xomofaki.getenjoyment.net/brownie_skillet_recipe_easy.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/rowuxoperevema.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/what_is_the_moral_of_tortoise_and_the_hare.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/jaCYie7/pilot_rollerball_pen_amazon.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/7da029ba561.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/1961584348.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/nosobiloseve.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/katuwiv.pdfIn PDF document text
    • http://lejebodaz.22web.org/86711781790.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/8c3d7464-315f-42b8-9fe8-14a909be7db5/nagoluxedaxoxevovok.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_e9468c002a054da8a66658f4ff85ec55.pdf?index=trueIn PDF document text
    • http://xofenilar.epizy.com/gilusudosafojokeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000f7480-4ca6-4fec-82c6-d6824bc3a7ce/jbl_eon_615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b9337e-f670-4cd3-90e4-8027ff43c3be/insinkerator_evolution_select_plus_3_4_hp_garbage_disposal.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/critical_thinking_movie_trailer.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_737d10024ed443e7870bf72817344dc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ffb0cf-37ab-4046-899b-7bd9af2c6b0c/muriderexifugup.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/how_to_program_pentair_superflo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968cc267-e9f9-44b2-bd3d-5def64095d66/how_to_program_motorola_xts_5000r.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_e65d5430f353414dbf0119695bf7cf4d.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_f76fded8176c41afb79c76d49de850e5.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_ba0fa4109d3f42e383af9b96a47e9ff7.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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 5608 bytes
SHA-256: 0c4ac3b6bb3b4283ba4ff74669f4194bacce380bb87125197df903d34869957e
font_01_sfnt_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 11180 bytes
SHA-256: df287383556cbf100d19439a9d923da0fc3564a70f6927cc644264b5011261b5