PDF malware analysis — malicious · 3b56dafe411684d5

MALICIOUS

PDF

76.3 KB Created: 2021-05-19 11:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 40ed9cb585fb6491cb0a0f6ec8e79f56 SHA-1: 71ce5f93fcc4de36cccf2223413faacb4201e976 SHA-256: 3b56dafe411684d5e359e1163c0bf41de6b8153df523e4fcde9fee3572cb2d34

216 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits multiple indicators of malicious activity, including a high ML classification score and ClamAV detection as a phishing trojan. The document employs social engineering by luring the user to install a browser extension or plugin, a common method for distributing malware or stealing credentials. It also contains a large number of external links, suggesting a potential link farm or redirection mechanism. The primary malicious URL identified is fokemale.ru.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://fokemale.ru/strik?utm_term=sample+of+transfer+letter+due+to+poor+service PDF link annotation
- https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/kogajekofurugosewik.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365607/normal_60580b396b1ab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4488842/normal_6036cbf3ac2d1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369659/normal_604ca1fa90c7c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404520/normal_60049121d2dda.pdfIn PDF document text
- https://fodukajanewirom.weebly.com/uploads/1/3/5/3/135383911/dimujuvuvegikajuz.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388183/normal_6023d3f12fa33.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374978/normal_605a23b7758a3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4487208/normal_5fd2d474d9ff6.pdfIn PDF document text
- https://zegusuvi.weebly.com/uploads/1/3/4/7/134738546/7028956.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/xefezesebusu/31830348593.pdfIn PDF document text
- https://s3.amazonaws.com/nabifovu/introducing_spring_framework_a_primer.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6b6d5aef-fc3e-4e5f-9d86-ef23a2adfd33/viking_grill_repair_service_near_me.pdfIn PDF document text
- https://s3.amazonaws.com/nosepevozux/xubizojujomaxufowedaba.pdfIn PDF document text
- https://s3.amazonaws.com/saziwijaxodav/what_is_the_regulation_of_cell_cycle_progression.pdfIn PDF document text
- https://s3.amazonaws.com/ritoma/divisions_of_the_nervous_system_review_worksheet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3a6b307b-5cb3-456b-bd5b-0c03c0d4ad0f/daxubojanomopamike.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f2748e42-e583-4a17-a478-2fc24766c942/cuisinart_tob-260n1_chefs_convection_toaster_oven_stainless_steel_best_buy.pdfIn PDF document text
- https://s3.amazonaws.com/xidulumexi/amazing_grace_chris_tomlin_sheet_music.pdfIn PDF document text
- https://s3.amazonaws.com/dudurat/gasavine.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFF	5464 bytes
SHA-256: `f73d8154e971cc48908019f2733a79b67745e151830c0ee9a08f687c06225a30`
`font_01_sfnt_off0000ff8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF8B	10612 bytes
SHA-256: `20e71510a89cf6fe4835fde0cff49363c973f548428233464fd51b19d1d6512d`

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