PDF malware analysis — malicious · dfd3bdccba83828e

MALICIOUS

PDF

85.3 KB Created: 2021-03-29 13:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: f3dcd0ea501ae4fdc6881a83a8275f86 SHA-1: 9b7e46be2749348e97b709c46fd9eed1bc1c5d33 SHA-256: dfd3bdccba83828e134c37f83eb1f366896ca0c27a0aefd8fd1bdfbf25b62eee

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 embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination through a large number of links on potentially compromised or disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=cbr+test+practical+pdf PDF link annotation
- http://xepujen.iblogger.org/mogegulukof.pdfIn PDF document text
- https://cdn.sqhk.co/geroterunetu/gjzgeji/34415877095.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4529024/normal_600ed4dd0387b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458144/normal_5fd8da720f174.pdfIn PDF document text
- https://cdn.sqhk.co/devuzemalut/ijqHie4/weaver_guide_for_ffxiv.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4468259/normal_5feb8f39464ab.pdfIn PDF document text
- http://sigonalen.22web.org/lejunawawedev.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501482/normal_6021aceb3e1ee.pdfIn PDF document text
- https://cdn.sqhk.co/xororofomed/hfjiUig/began.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375196/normal_602eea2429d79.pdfIn PDF document text
- http://sandwichhq.club/76164519355felk2.pdfIn PDF document text
- http://scoretdho.best/59771558151jx7a9.pdfIn PDF document text
- http://13millions.store/312578480011ftz3.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
- http://jozixal.epizy.com/how_to_use_a_nespresso_vertuoplus.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/841d3359-f049-41c3-b761-291002c4a1ec/42245020928.pdfIn PDF document text
- http://vijelovisisojo.rf.gd/words_bee_gees_piano.pdfIn PDF document text
- http://sigozezigi.rf.gd/robuzide.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6db89ab3-c5c5-466f-80df-79b3c6373eae/98767528017.pdfIn PDF document text
- http://lofomaseforuz.rf.gd/31370689821.pdfIn PDF document text
- http://zugumez.rf.gd/nolomakonidufugufotix.pdfIn PDF document text
- http://walorute.rf.gd/godox_ad200_user_guide.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f463c65b-6a40-41c8-b5a3-55af9c3a61c6/what_is_the_best_free_calorie_counter_app_for_android.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ed7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED7A	4884 bytes
SHA-256: `e8d870ff0bad334344384e86c51ad63db18c7d40578709b598c0d1fcd89cf069`
`font_01_sfnt_off0000fe1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE1C	11228 bytes
SHA-256: `cde189c2f1f7504650632f34711f105628f5400ff1f98db30b01031c7e0befed`
`font_02_sfnt_off000124de.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124DE	16060 bytes
SHA-256: `713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74`
`font_03_sfnt_off00013970.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13970	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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