PDF malware analysis — malicious · 83f6903312d5f25f

MALICIOUS

PDF

80.9 KB Created: 2021-04-14 12:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: c70ed0bc8e1724d7ea8538ef9520a80e SHA-1: be6d67f7b6722345de8182861026ae0f5107eec6 SHA-256: 83f6903312d5f25f0d4d2c092db35dd5d1f0a7d64f8ac2de5c2ee778b6c2b378

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://seumenha.ru/strik?utm_term=chicco+nextfit+zip+air+manual+espa%25C3%25B1ol PDF link annotation
- https://cdn-cms.f-static.net/uploads/4408009/normal_5fd8e837a0267.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375698/normal_604641a7d1a6e.pdfIn PDF document text
- https://cdn.sqhk.co/gorokipo/cjiDghd/61023660001.pdfIn PDF document text
- http://fevinoreniwelik.sportsontheweb.net/85763036281.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443342/normal_605887190b482.pdfIn PDF document text
- http://rapoxarawiwalo.sportsontheweb.net/what_does_submissive_mean_in_the_bible.pdfIn PDF document text
- http://sawedes.mywebcommunity.org/ruzixusifojip.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387924/normal_602cac6ebdd35.pdfIn PDF document text
- https://cdn.sqhk.co/rasirise/dhdAYjc/28098532468.pdfIn PDF document text
- http://wemuwetafivaxe.sportsontheweb.net/anarchy_workout_abs.pdfIn PDF document text
- http://giwapozolaleg.mypressonline.com/does_the_mossberg_500_have_a_rifled_barrel.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_83ad33c42dd04700bbd76dce9ead5359.pdf?index=trueIn PDF document text
- https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_d67eb275d0b44f7192739a728f588dc6.pdf?index=trueIn PDF document text
- https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_d1b1c37239e343cfbf0d6ba3f2ef2ad8.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vutame/cerwin_vega_vpas10_manual.pdfIn PDF document text
- https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_b1276a86694747699f89af4e7446a687.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bulikowexunepov/pastimes_the_context_of_contemporary_leisure_6th_edition.pdfIn PDF document text
- https://s3.amazonaws.com/dezajok/nafixeruve.pdfIn PDF document text
- https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_53438e6276834bc8abbfa366cc84b8ca.pdf?index=trueIn PDF document text
- https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_f59346adbed44bc0a5b8ee9000f8d336.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/rovikibixu/sample_obituary_for_mother.pdfIn PDF document text
- https://s3.amazonaws.com/vigevot/concrete_mix_design_books_free_download.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_off0000f286.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF286	5488 bytes
SHA-256: `6e3811a0b59176f55a224f542e9aff0e2f07ab75cd77868e675dd01c22babf5d`
`font_01_sfnt_off000104c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C8	1800 bytes
SHA-256: `daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e`
`font_02_sfnt_off00010d56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D56	11200 bytes
SHA-256: `30d0cd3a421703fec4cfb4753356f220c204387dfac47298d2fdae2bb9eabd88`

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