PDF malware analysis — malicious · 674bf12810de1611

MALICIOUS

PDF

52.6 KB Created: 2020-11-14 15:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: a39248c3c47bf2145788150591832a45 SHA-1: 3e42021d4cb288a77ab83c931dd231b3001c08cf SHA-256: 674bf12810de161124019935ab7fcb9e07d76e818fcde7e0210eb33753b1a78b

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.8466

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 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
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=physioex+9.1+exercise+3+activity+2 PDF link annotation
- https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/guzedewadarilez.pdfIn PDF document text
- https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/0fd65f3.pdfIn PDF document text
- https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/5545148.pdfIn PDF document text
- https://pafuzoxim.weebly.com/uploads/1/3/4/5/134585506/nomimalevuve.pdfIn PDF document text
- https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/8001545.pdfIn PDF document text
- https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/2505118.pdfIn PDF document text
- https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/afda2.pdfIn PDF document text
- https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/6616882.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/felasorarabipis/comment_assembler_2_en_1_mac.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cfd8dcba-60a1-4832-9276-56b94e621f92/vasogukomegetifesaduwig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1e459b9e-fa84-4f03-9f84-4645aec73ea1/jokogagudugapudidiwe.pdfIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bb3d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB3D	5620 bytes
SHA-256: `0b30e41870e2fe9234c2cb078c80d684c037bc10dc5960af8213a7730cfeec85`

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