PDF malware analysis — malicious · 356b238dbee23435

MALICIOUS

PDF

81.3 KB Created: 2021-02-25 00:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 771236b22a0f8bfb87ac4c60d1cb2c84 SHA-1: 8542e0babe5664e8d77b447db2a8b6ffb3caf1e2 SHA-256: 356b238dbee2343583f24256088d5f5ba31eda8e087b014d83ea8efe1ed3dd94

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic identifying it as a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=ask+and+it+is+given+free+pdf+download+full', suggests a lure for a free PDF download, which is a common tactic for phishing or malware distribution. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the PDF structure and embedded links indicate a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=ask+and+it+is+given+free+pdf+download+full
- https://ginamelemu.weebly.com/uploads/1/3/4/6/134624442/dakerizelotezofake.pdf
- https://cdn.sqhk.co/jedelamodafa/jdEaud6/real_steel_2011.pdf
- https://cdn.sqhk.co/xasurila/ftBheVN/35962612067.pdf
- http://faxusupovetek.sportsontheweb.net/gifuriruwewodepog.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/wunojipu/vedumobumavopemuxew.pdf
- https://s3.amazonaws.com/gofiguj/42914903366.pdf
- https://s3.amazonaws.com/bidurudilidujug/java_jre_7u51_64_bit.pdf
- http://mopuser.epizy.com/59192141806.pdf
- https://s3.amazonaws.com/verirejon/pefuzavulomaxogivojul.pdf
- http://ridubebik.epizy.com/xatig.pdf
- https://s3.amazonaws.com/gozifep/xafonidigixebuma.pdf
- https://s3.amazonaws.com/tometubufimopim/kali_linux_latest_version_2019_iso.pdf
- https://s3.amazonaws.com/belapawerezuju/avanza_veloz_2014_manual.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_off0000ff44.bin` `950c54af9235fdc2f2b3a68de0b070dacffaef91374566dc5e4417931498cf26`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF44	5412 bytes
`font_01_sfnt_off000111e1.bin` `8a7311e3f148c07f17df7842266b63d26f218e292855bb6ae3e5aadf12530720`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E1	11312 bytes

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