PDF malware analysis — malicious · f6223c497efeca8b

MALICIOUS

PDF

72.8 KB Created: 2020-12-30 17:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 052ed81012bc1ca092345c472ea236cb SHA-1: 167e8316e83ef1324f42eb985247780a5d647194 SHA-256: f6223c497efeca8bcf4e25effdba05196678f57bbd52242e99319db5a52bfd98

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. One of the embedded URLs, 'https://trafffi.ru/strik?utm_term=formula+for+area+of+a+square+based+pyramid', is likely part of this scheme. The document body is heavily obfuscated and appears to be a lure related to mathematical formulas.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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 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://trafffi.ru/strik?utm_term=formula+for+area+of+a+square+based+pyramid PDF link annotation
- https://fexupewoxi.weebly.com/uploads/1/3/4/6/134619994/texav.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368982/normal_5f8b119cecccb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372983/normal_5fb525d026eb9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366976/normal_5fc9e6f83c0de.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393898/normal_5fba965a95225.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415754/normal_5fe95569a0d9e.pdfIn PDF document text
- https://siregudak.weebly.com/uploads/1/3/0/7/130738759/xileteb-filimomixogolag-goguvigadixi.pdfIn PDF document text
- https://xabetujozuveko.weebly.com/uploads/1/3/4/6/134682227/rukep.pdfIn PDF document text
- https://cdn.sqhk.co/mifimafonuku/Fib9Nib/44190441110.pdfIn PDF document text
- https://cdn.sqhk.co/faxiwapa/qXLxUje/bee_crafty_doodle_stamps.pdfIn PDF document text
- https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/bowadajedu_xewewiraxuvuna_japejaxege_sotadap.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://s3.amazonaws.com/ronatiduzoxij/45576828084.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1b554030-b991-43cb-bc35-8a7f6013f0a9/pics_word_game_level.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a9d3b5e0-62c9-4844-bdd0-8f86bba1825d/glow_plug_relay_issues.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0eef75eb-d273-4bdb-b5c4-065209f16b24/28036827847.pdfIn PDF document text
- https://s3.amazonaws.com/jazuravazaguz/15450665668.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/867c861b-8f06-4f1d-9d4c-f8154cb0e287/47968774411.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/59a4ff5b-b8bf-4c3c-a962-81c48ecd7cc5/90947048624.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d118.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD118	5208 bytes
SHA-256: `556ef2efc7611e7001f81cb43c1f9a226fd4232db4c8d228bfe9afbaee6763c9`
`font_01_sfnt_off0000e2c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2C4	10832 bytes
SHA-256: `7ee7ea96b990a6de7e055b6d168fb93c1243643f237769d9c152167b70487da9`
`font_02_sfnt_off000107df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107DF	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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