PDF malware analysis — malicious · 2927c071a39ffa98

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 13:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 957bcba9ee303db63579076951010323 SHA-1: 2732c026236c4a671e588e2946ac618e4ffd8cad SHA-256: 2927c071a39ffa98fba890aa4d7acd952814f5fb5c8201f058636ef8bde3ca06

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is associated with a 'what is the box model mcq' query, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=what+is+the+box+model+mcq PDF link annotation
- https://cdn-cms.f-static.net/uploads/4417213/normal_6017a91f1457d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391921/normal_5ff2d517ed434.pdfIn PDF document text
- https://cdn.sqhk.co/dugelabomaw/jbhhhdz/ascaso_uno_manual.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4406789/normal_5ff77a2ccd79b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384325/normal_5fe53dfdd9311.pdfIn PDF document text
- https://cdn.sqhk.co/gufemazibafi/aCijdRd/std_10_maths_practice_work_gujarati_medium.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421944/normal_5ffe9a22e6c8b.pdfIn PDF document text
- http://fegalaro.iblogger.org/96260692334.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4375528/normal_5fff085a81ce5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419623/normal_602c0f716c1f0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4494451/normal_5fd876704c744.pdfIn PDF document text
- https://cdn.sqhk.co/ratufewebu/jjghbR5/jeux_baby_hazel_halloween_party.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4473359/normal_6022925c9801d.pdfIn PDF document text
- https://cdn.sqhk.co/lobinazema/jenqlKx/mortal_kombat_x_cheats_for_android_phones.pdfIn PDF document text
- https://cdn.sqhk.co/ninulekuto/hfjaiaq/batman_the_enemy_within_season_3.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://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_7a2c33b1b88c42108bbe55d4f56b3be2.pdf?index=trueIn PDF document text
- https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_6f80f73a40db4a538414def8f3718e44.pdf?index=trueIn PDF document text
- http://kagubosewox.epizy.com/common_core_integrated_math_2_worksheets.pdfIn PDF document text
- http://felanad.rf.gd/kelumepurogezudo.pdfIn PDF document text
- https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_b7e2d251943644b5a1988c5cd61200d6.pdf?index=trueIn PDF document text
- https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_2ac505e68c1f4367a46c0b70743062ea.pdf?index=trueIn PDF document text
- https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_9da7585eb51f4fc8b3f97eec9aa6ff89.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_off0000e87a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE87A	5112 bytes
SHA-256: `70a91c3a80dda85c6007debd0b434de17606abae298e158828d6108df4f87abc`
`font_01_sfnt_off0000f9e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9E8	11744 bytes
SHA-256: `e11f57ff286fe1086f1fd0340f8cb6202cfb3d655b000b49b044eefee97847e6`
`font_02_sfnt_off000121e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121E3	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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