PDF malware analysis — malicious · 1ab397ba50b081db

MALICIOUS

PDF

75.2 KB Created: 2021-02-18 19:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 977ef57b3abd76e44103df7d83c8e624 SHA-1: e431710a475ffa292c81379a69d348148a9c1ef3 SHA-256: 1ab397ba50b081dbe7ed19499c0418f8547398ef48b8c822c58315c0804c4d2b

206 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or scam attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where users are prompted to call a number. No scripts were extracted, but the presence of numerous external links and the callback lure strongly suggest a phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
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://druttle.ru/strik?utm_term=fraud+examiners+manual+2016+pdf+free+download PDF link annotation
- https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/ad226e3c156c3.pdfIn PDF document text
- https://cdn.sqhk.co/sepagumal/Hbjhijn/pezapivewiriwuwapibazo.pdfIn PDF document text
- https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/9300575.pdfIn PDF document text
- https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/2d38d0.pdfIn PDF document text
- https://rifojiditesi.weebly.com/uploads/1/3/1/3/131379396/bugifajuj.pdfIn PDF document text
- https://cdn.sqhk.co/rapekerokemo/cnibicN/teaching_strategies_gold_documentation_examples.pdfIn PDF document text
- https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/gikinimogukifibigal.pdfIn PDF document text
- https://cdn.sqhk.co/bapulofuw/BieqPhg/gas_pump_card_reader.pdfIn PDF document text
- https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/2237388.pdfIn PDF document text
- https://kuxodebareku.weebly.com/uploads/1/3/4/0/134042390/dovinoji-juvopujuvegakib-kemegofikufud.pdfIn PDF document text
- https://cdn.sqhk.co/negapevu/ahbDfjd/dejisabufebonedu.pdfIn PDF document text
- https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/4430014.pdfIn PDF document text
- https://cdn.sqhk.co/fexilejedit/pgXhf4k/6167099571.pdfIn PDF document text
- https://cdn.sqhk.co/ributexovek/adThceo/galaxy_air_force_war_mod.pdfIn PDF document text
- https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/1992331.pdfIn PDF document text
- https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/117a7e2ed91156.pdfIn PDF document text
- https://cdn.sqhk.co/bitaxukezor/jfdighc/fejinijomon.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5C6	5784 bytes
SHA-256: `d3426ed786a3b77fe3a418f89211a77635d837f999bda88f8d8fb15d6ec88ca3`
`font_01_sfnt_off0000f978.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF978	11236 bytes
SHA-256: `4486867b817febe5d9fad1079720113715a6910895b1dfbe479726729c774a25`

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