PDF malware analysis — malicious · 91242e78f3a6948d

MALICIOUS

PDF

81.2 KB Created: 2021-02-17 01:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 028f04493e783468b038c7d71c3cd9b5 SHA-1: 342ba26327e2f80de4545e9bc8d3a8458b502538 SHA-256: 91242e78f3a6948d5929146d45119b4e4b1a22ae528f3d3968b691c26accbbb3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://baarspo.ru/wb?keyword=how%20to%20learn%20home%20electrical%20wiring, appears to be a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or hosting further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
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://baarspo.ru/wb?keyword=how%20to%20learn%20home%20electrical%20wiring PDF link annotation
- https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/3651972.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403940/normal_5ff33f5d928c4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4460243/normal_60094d40235ab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407318/normal_601f71ebd6d04.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454052/normal_5fe29cc0b689f.pdfIn PDF document text
- https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/daworewa-xesugexasem.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4529149/normal_5fe6a86a5b3ac.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4404503/normal_5fc71a6080727.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4471941/normal_60109da602d67.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4455406/normal_5fed5a68f0471.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412599/normal_5fffec2430a1a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446275/normal_5fe62a5d6b52f.pdfIn PDF document text
- https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/3efe3ec14de.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455881/normal_5fe9ceb23d02d.pdfIn PDF document text
- https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/5408594.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/vezumobigodub/despicable_me_full_song.pdfIn PDF document text
- https://s3.amazonaws.com/pomaxa/zawotawu.pdfIn PDF document text
- https://s3.amazonaws.com/joterige/free_bypass_google_verify_apk.pdfIn PDF document text
- https://s3.amazonaws.com/muwomapotumugi/68132156378.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ecc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC6	5088 bytes
SHA-256: `3e5a777bfa0f798387579c2a700dd02417551dc83b326c77dc25818333e58bf9`
`font_01_sfnt_off0000fdf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDF6	10500 bytes
SHA-256: `54d9bf7719c108c477725576a21c2f609ca2f9c6606c214a2d405ff5fd261cd4`
`font_02_sfnt_off000121e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121E9	16144 bytes
SHA-256: `18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b`

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