PDF malware analysis — malicious · bcf0ec6584c99371

MALICIOUS

PDF

71.8 KB Created: 2021-03-02 16:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 5ec8781c4f5bedf8e713deab01c3a5c0 SHA-1: d6d29ef0a6057878c0f5dce4f2d9af79f8f88907 SHA-256: bcf0ec6584c99371eb32aee6358ae716e2cba3872bf2838b3fc19502008828ff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically phishing or trojan activity. The embedded URLs are likely used to redirect users to malicious content or further stages of an attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://bologen.ru/123?utm_term=can+a+chevy+traverse+be+flat+towed
- https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/460549641fdeca0.pdf
- https://cdn.sqhk.co/lekusovu/hajaihm/comedy_central_roast_alec_baldwin.pdf
- https://cdn.sqhk.co/kebokeregim/ijCNOen/89281608276.pdf
- http://storezone.info/calculus_clep_exam_study_guidef1rfk.pdf
- http://jufidozotazi.66ghz.com/wodapawokafumolu.pdf
- https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/9f6b08e9e4e497.pdf
- https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/861419.pdf
- http://clubstore.info/download_let_it_shine_full_movie_2_hours_mp3s5p0r.pdf
- https://static.s123-cdn-static.com/uploads/4505820/normal_5fc6bc52d7017.pdf
- https://cdn.sqhk.co/depivuni/fR1hiG2/raredojonemaninatubix.pdf
- https://cdn.sqhk.co/mobixipotex/hJUbfFC/human_body_proportions_fun_facts.pdf
- https://cdn.sqhk.co/molodomo/hihggfm/cake_pop_maker_vs_handmade.pdf
- http://migriruy.ru/historia_derechos_humanos5hous.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://tejademadubo.rf.gd/69307752660.pdf
- http://muweluboxakok.rf.gd/82872116415.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc7a.bin` `3f08800324548a4351d9ffffc0d50e740396bb45237349e7e69320837effa28d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC7A	5408 bytes
`font_01_sfnt_off0000eef1.bin` `f42f05468d22de95b90f6de8c60f07f49b22b82484d7cbe09b0d51ac6233b058`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF1	10348 bytes

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