PDF malware analysis — malicious · 4c8ec92ab207c192

MALICIOUS

PDF

77.9 KB Created: 2021-04-15 12:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: edd55811353506cbc96cab23fe974067 SHA-1: c6b43b836e419c56238647a246ee49c8dd37aa18 SHA-256: 4c8ec92ab207c192b1057ddf79e632bb9ccd4aebf718b2acdd1dd97b2ad6f7da

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the numerous external links to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point to a strategy of directing users to external resources, likely for further exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=cyberpower+1500avr+software PDF link annotation
- https://static.s123-cdn-static.com/uploads/4410441/normal_5fe23f9d9fe25.pdfIn PDF document text
- http://gufutaca5.xyz/617878076768relt.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470972/normal_60477ac27a722.pdfIn PDF document text
- http://xeeewq.xyz/wizz_air_careers_cabin_crewtjd8d.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://wafovon.epizy.com/suxijezozi.pdfIn PDF document text
- http://rupilozomu.epizy.com/87510535349.pdfIn PDF document text
- https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_704ee4a6b9014183aab78c4f4cde48c6.pdf?index=trueIn PDF document text
- https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_8eb3adc61e30413498f52ebcb28fb7aa.pdf?index=trueIn PDF document text
- https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_c59505bbe3f249cca60fb052a68d6fd9.pdf?index=trueIn PDF document text
- https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_e720dec4d6d74a26bc0a8bb324baf8da.pdf?index=trueIn PDF document text
- https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_db228b855bd546179984f2e9b7a43b46.pdf?index=trueIn PDF document text
- https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_cf2a3239745e4153a9a0896061c56e5d.pdf?index=trueIn PDF document text
- http://loluwoje.epizy.com/pagapelunezajoxivoxemoruf.pdfIn PDF document text
- http://zixadadafupeg.epizy.com/41998701887.pdfIn PDF document text
- http://gosovugan.epizy.com/palaziwaketosuxifomitej.pdfIn PDF document text
- https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_38ccd89f501242f491bb4679727edc1c.pdf?index=trueIn PDF document text
- https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_f311975cdcdb43eb91056dda5824f8f8.pdf?index=trueIn PDF document text
- http://lapojuvide.epizy.com/bluestacks_2._0_rooted.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e552.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE552	5232 bytes
SHA-256: `ebfd93a626abdce04dfa2e736185d7c49e4e81286c3bfc0644d31b11c451228b`
`font_01_sfnt_off0000f750.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF750	11064 bytes
SHA-256: `d4a9d9e55c7dd20ef63517368a9e04182a0582a8417982b808eb5f8d44da49ee`
`font_02_sfnt_off00011cb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CB3	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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