PDF malware analysis — malicious · b9cbf2492bd4a483

MALICIOUS

PDF

157.2 KB Created: 2021-03-31 01:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: bdd007771ff2c3db939e899fea90c970 SHA-1: d42d72311e95864f9045eff85cfc8face87e6b91 SHA-256: b9cbf2492bd4a48337fdef5a7212d11a01b76d710b328227c48118ed24f4e70c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially obfuscated, suggests a lure related to 'Penguin English books pdf'. It contains numerous external URIs, many pointing to disposable domains, which are likely used to host phishing content or further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 5

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.
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://maypoin.ru/award?keyword=penguin+english+books+pdf PDF link annotation
- http://alexandreablog.com/15074429591g9y0q.pdfIn PDF document text
- http://artyom.guru/55333361975pul1r.pdfIn PDF document text
- https://cdn.sqhk.co/nukusigemug/hd7ciaV/pabexuf.pdfIn PDF document text
- http://smartradiobf.ru/xewajuvdu08.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367643/normal_600fe5988e44b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484097/normal_601fdfe66ec0f.pdfIn PDF document text
- http://cookwellbakewell.com/zuxeviladunagonezijamesodg2l27.pdfIn PDF document text
- https://cdn.sqhk.co/mofosalamo/47sgfhg/wolf_girl_anime_base.pdfIn PDF document text
- http://luvetikemo.66ghz.com/academic_performance_of_athletes_in_the_philippines.pdfIn PDF document text
- http://lidzadva.xyz/zudomasogurawosetimozitqt7qf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413982/normal_5fcf52d12f13d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406516/normal_6004cb7e2aa9a.pdfIn PDF document text
- https://cdn.sqhk.co/runetonorox/0heFid7/onedrive_sign_in_spinning.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
- https://uploads.strikinglycdn.com/files/d76c5eb9-e658-4293-b8a5-a05e103450a8/11954100577.pdfIn PDF document text
- https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_edb850f7590f4bd586265040eb2d9e6b.pdf?index=trueIn PDF document text
- https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_09f12b6bc5e54cafaef23b692c31a9b9.pdf?index=trueIn PDF document text
- https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_bd451ea80034441a8dd9dcc3e363f259.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/11d11032-1e48-436f-8d5d-e22a94b7eb0a/16102162640.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/77732ccb-ac3d-4d66-9332-30a4ce5d44a3/xividumumigigito.pdfIn PDF document text
- http://widitedofirok.rf.gd/70286574164.pdfIn PDF document text
- http://xalanijowule.rf.gd/retol.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00021586.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x21586	5004 bytes
SHA-256: `6152ddf94d78b0cdca063fc8c5b99de5cecb5ad43ac00cbc5a00453a55e13811`
`font_01_sfnt_off00022666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22666	1800 bytes
SHA-256: `51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0`
`font_02_sfnt_off00022ef4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22EF4	11632 bytes
SHA-256: `173aa246113cc7f656195f7cb39b263200e7b5b6bc56da677e552ab238645fe5`
`font_03_sfnt_off0002561d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2561D	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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