PDF malware analysis — malicious · 5ffcaa1d70d032c0

MALICIOUS

PDF

84.0 KB Created: 2021-04-05 13:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 74fa4b022e7bcf43ce27ae81451ee2f0 SHA-1: a5e655770076b3087cca9f8098610998b24d1244 SHA-256: 5ffcaa1d70d032c05610596efc5d0fa4c8d08af6c77d421e3aaf8ac0eb986bc4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily corrupted, contains keywords related to academic reviews, likely intended as a lure. The primary attack pattern involves directing users to potentially malicious or spam-related websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://xezojetit.ru/wix?keyword=geometry+chapter+4+review+answers PDF link annotation
- https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/bijavalopodo_kijokigi_jofeb_pejimor.pdfIn PDF document text
- https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/bosuzemukew.pdfIn PDF document text
- http://fredo.bike/72328247376w62jg.pdfIn PDF document text
- http://matcobzor.ru/ferrari_488_pista_for_sale_cargurus4vrp4.pdfIn PDF document text
- https://cdn.sqhk.co/guwuweri/gdihAB4/homescapes_cheats_android_without_verification.pdfIn PDF document text
- http://about-central.com/75313527200lulb7.pdfIn PDF document text
- https://cdn.sqhk.co/disumuneriva/fLHgij7/lizixotuladozupawovobutuz.pdfIn PDF document text
- https://gikositaga.weebly.com/uploads/1/3/4/7/134773380/184067.pdfIn PDF document text
- https://cdn.sqhk.co/numiwufeguv/gfgcjgp/eric_church_new_song_some_of_it_lyrics.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/225d1f94-5842-4066-9474-7604f29e9e65/87925087713.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f13ebd1d-e73f-448a-b05e-eee65c6b5c97/20713496089.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/02949d5f-809b-46da-a589-3bd817e5a405/pijakibufazozipesatuf.pdfIn PDF document text
- http://rujidita.rf.gd/26740221877.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0758db47-65ea-4939-bd2f-8a04ea6f3694/12110366664.pdfIn PDF document text
- http://desavoz.epizy.com/classroom_instruction_that_works.pdfIn PDF document text
- http://nawaroxepemif.epizy.com/filokugizi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5ee15d36-acea-4cbe-9503-64d745761ff6/kepagitonapozimugo.pdfIn PDF document text
- http://tewederukafolez.rf.gd/56911633353.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f036.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF036	5512 bytes
SHA-256: `bbb53df9b56118de75ac58ccb71e664d7be2c565ca4eea46a25324f369e90cf5`
`font_01_sfnt_off000102ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102EE	12644 bytes
SHA-256: `d1889e3549147dbc120007b2568d6db81c768d0ba6e686b2824d12ca0b9c6aed`
`font_02_sfnt_off00012dc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DC7	16072 bytes
SHA-256: `4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd`

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