PDF malware analysis — malicious · 8c3c909bf0d5e363

MALICIOUS

PDF

61.9 KB Created: 2020-12-17 22:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2712b1e5c91064b987cb0bea3ce4f89d SHA-1: d74073f1e9d0471473ef1260b7647b7aa08ced40 SHA-256: 8c3c909bf0d5e3639d7591bd0cb6537b82e871e8b2b0b52cee8b34e99799be9a

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a significant number of external links, identified as a link farm, with the primary malicious URL being traffset.ru. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as Pdf.Phishing.Trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise malicious activity. The presence of external links points towards a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://traffset.ru/strik?utm_term=fluidmaster+model+300+replacement+parts
- https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/motinovoka.pdf
- https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/be33cf0d.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/jolufozo/azitromicina_500_mg.pdf
- https://s3.amazonaws.com/wizedumi/nepiwag.pdf
- https://s3.amazonaws.com/wefemabeni/metal_gear_solid_1_guide.pdf
- https://s3.amazonaws.com/xesigeze/gangster_granny_3_apk_data.pdf
- https://s3.amazonaws.com/sikuva/nojowimeveru.pdf
- https://s3.amazonaws.com/vidadaviwal/64437910963.pdf
- https://s3.amazonaws.com/jagux/kerboodle_answers_physics_combined_science.pdf
- https://s3.amazonaws.com/fosagoba/6690282719.pdf
- https://s3.amazonaws.com/tobaziw/ocbc_cashier_order_form.pdf
- https://static1.squarespace.com/static/5fc5aba47d0c8f249d617a7e/t/5fcdb24ae43f2b00a8c6c9fd/1607316044578/occupational_therapist_assistant_salary_florida.pdf
- https://s3.amazonaws.com/meludav/sevisejuk.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_off0000b311.bin` `ea819ef5f4a05413d642675cc48fe872ca642e9f202ce7e971aef7b0c07e59ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB311	5480 bytes
`font_01_sfnt_off0000c598.bin` `aa84a9fc064358c9b46ddf119ebfc238fb110832cf428112980727eb8050e481`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC598	10944 bytes

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