PDF malware analysis — malicious · 56ed910b05772882

MALICIOUS

PDF

92.3 KB Created: 2021-03-18 17:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: 94ba97294121b314d6313dc2e7606d40 SHA-1: 427ea4baa9f8136d63ad9c5302b7821637f87473 SHA-256: 56ed910b05772882df4f84fd6f9f9024545099b7ff532fc99dcbee04dac99081

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to 'vilenefex.ru/award', suggesting a lure to download content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to distribute malicious files or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

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 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://vilenefex.ru/award?keyword=grade+9+biology+textbook+pdf+download PDF link annotation
- http://how2clever.com/36732503244v460r.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453100/normal_6040ec258c559.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382974/normal_60482619c916a.pdfIn PDF document text
- http://regvoolkim.website/diode_function_generator_meaningngvo1.pdfIn PDF document text
- http://electorat.org/jetadmin_installation_guideqpsh9.pdfIn PDF document text
- http://sellforce.ru/chamatkar_movie_song_mp4n11zm.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366324/normal_5fe1e97f1e9d0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377905/normal_602550f832891.pdfIn PDF document text
- http://wonder-ita.space/4714504582r9ufq.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4392869/normal_5feeb98281e94.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418590/normal_5fcaaedd7334e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379233/normal_5fffd4caa144c.pdfIn PDF document text
- http://lalat.space/electron_configuration_energy_levels_worksheetb8ecy.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://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_616e5c3788bd4f18b88eb9ae4d84791a.pdf?index=trueIn PDF document text
- https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_80c62d2b243e4d7b99f5181d82f9ef4d.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/minaxigevani/subject_verb_agreement_worksheet_grade_8.pdfIn PDF document text
- https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_fe6bf26f51874d7e97a307dc61285260.pdf?index=trueIn PDF document text
- https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_1598dedc785741ea9d13d50e9085b730.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/woxorojero/20955446682.pdfIn PDF document text
- https://s3.amazonaws.com/pirofopafu/63665234771.pdfIn PDF document text
- https://s3.amazonaws.com/vudivuzakal/what_type_of_oil_does_a_2009_toyota_corolla_take.pdfIn PDF document text
- https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_d392a59e24ea4a8e810c2e948c0ca605.pdf?index=trueIn 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_off0001186a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1186A	5472 bytes
SHA-256: `f5471807e183d7668b44ce5784ca462650603359c47dbd43e8dd728058f1c6cc`
`font_01_sfnt_off00012b36.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B36	11952 bytes
SHA-256: `57fbbcb70866e8848c2ebd3eccc279a4600bc0406b3d0915fb4eefff05106d34`
`font_02_sfnt_off000153e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153E8	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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