PDF malware analysis — malicious · 066836bcbf52e222

MALICIOUS

PDF

84.3 KB Created: 2020-12-16 09:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 7f3d0e815207f40b6113688575aeaff3 SHA-1: 80eb6dfe1dae006c5a9e9a281e6fe644003707a5 SHA-256: 066836bcbf52e222e68584abe32a0aaf936e3c8218e0947c4408e6d97eb72983

206 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links pointing to disposable hosting, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content distribution lure, likely delivered via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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/123?utm_term=army+information+assurance+test+answers PDF link annotation
- https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/pukumekezojes.pdfIn PDF document text
- https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/f190c90e.pdfIn PDF document text
- https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/79b083ee9cf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4376600/normal_5faa1c3843a90.pdfIn PDF document text
- https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/jezevugikesar.pdfIn PDF document text
- https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/8560536.pdfIn PDF document text
- https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/disiwudupe.pdfIn PDF document text
- https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/74e88eb3ff4c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368474/normal_5f957824b20fb.pdfIn PDF document text
- https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/3555bb.pdfIn PDF document text
- https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/4208095.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://static1.squarespace.com/static/5fc0d2f2d26ff1194f734ddd/t/5fc2b067173fb5383bfb8e90/1606594664155/wobodaxefolonogamimoxogew.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8ddda887-0a60-48d7-abde-acfdb7f20d00/xetowefexizamaxerosatonam.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/88c38d38-cc21-4e83-8a2d-89e7d4750f3c/indian_novels_free_download.pdfIn PDF document text
- https://static1.squarespace.com/static/5fc1beaab8467722f1da3b48/t/5fc5e5242dd96f5918b93934/1606804773753/wuxunozalosoketudasu.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_off0000fffb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFFB	5060 bytes
SHA-256: `3375ca01d2f4ad311b426b6b5e1727b4419d4d0bd9f7346367021887f32e6b56`
`font_01_sfnt_off00011124.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11124	10876 bytes
SHA-256: `cbd024d3b2fee8c79cd5ecef32c502cd218ab33fb66f9ab1c49cac24ed5f94c4`
`font_02_sfnt_off00013635.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13635	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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