Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb3f39fcc795543…

MALICIOUS

PDF

126.1 KB Created: 2021-03-24 23:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1c51a6cb2602a6d4e69b809954f01698 SHA-1: 613afcf4544f144dba9d01099e427708962486f9 SHA-256: eeb3f39fcc7955430c256b04e99a46067636c92b0998a11782791ef454aced76
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 services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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=skam+italia+season+3+episode+5+i+will+never+hurt+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502870/normal_60113af6cffbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_600f0769717af.pdfIn PDF document text
    • http://fogexiduk.22web.org/carpentry_workshop_manual.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/pimatozunegiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_6053761f2c873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6038bfc0aa12e.pdfIn PDF document text
    • https://biridavevisosel.weebly.com/uploads/1/3/1/4/131406146/2d4a9a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_605b91e7a6889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5ff2875de098d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_604ad7dc1e608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_60021a9bc7879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd7dc6f109dc.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/porotevu-varelo-noxolotapoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nepafex.epizy.com/world_best_photo_editor_app_free.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/20336286379.pdfIn PDF document text
    • http://bijesinatepeli.epizy.com/socrates_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0726848-518d-46a7-9aeb-89083c40d430/dudexebumamo.pdfIn PDF document text
    • http://wagamaxoja.rf.gd/the_pit_and_the_pendulum_ending_explanation.pdfIn PDF document text
    • http://migebepumeneba.rf.gd/present_caliph_of_islam_send_feedback.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101e4cab-9ba9-4f3d-97a6-5bcf0e1a2d6a/netgear_wgr614v9_speed.pdfIn PDF document text
    • http://zedofizanotigip.epizy.com/2012_chevy_silverado_lt_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38178d75-ae7f-4c24-b872-44f51a24ff71/nezufapovubusijerobeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ddf25c-f8a2-4b42-8b6c-298799482aa2/wepofinezojilono.pdfIn PDF document text
    • http://dolizanawuw.epizy.com/27632261543.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_off00019d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D7C 5788 bytes
SHA-256: a5c87bb5ce6b7fa5a59ed64329546b7c47a0b2b206504ab858672e710548875c
font_01_sfnt_off0001b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B117 13968 bytes
SHA-256: 1a2061e07dba51a8a8e86f40580c9c423412118fd8e5356275af4cad51d306eb
font_02_sfnt_off0001dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC1C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378