PDF malware analysis — malicious · 5b5043e83accdd82

MALICIOUS

PDF

72.9 KB Created: 2020-12-23 02:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a90abbabfc36b42f543f2215fae599a8 SHA-1: d7228ee92e7123b600077064426ec8d4e4942508 SHA-256: 5b5043e83accdd82c25fbc848006c44d7250e79f325c265adabe1119bde8d4eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://traffnew.ru/strik?utm_term=%25D0%25BE%25D1%2587%25D0%25BA%25D0%25B8+gunnar+optiks+intercept', is flagged as suspicious and likely leads to a phishing site. The ML classifier and ClamAV detection strongly indicate 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-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://traffnew.ru/strik?utm_term=%25D0%25BE%25D1%2587%25D0%25BA%25D0%25B8+gunnar+optiks+intercept
- https://cdn-cms.f-static.net/uploads/4367000/normal_5f878eb433f66.pdf
- https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/3611699.pdf
- https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/seworapogolokim.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/20fc5471-750a-4673-ab4c-c7e8f712184b/incenter_definition_geometry_examples.pdf
- https://uploads.strikinglycdn.com/files/672558d7-7263-48c6-b56e-497a3274a76a/41807539829.pdf
- https://uploads.strikinglycdn.com/files/20b7f24c-2d20-43a0-b2d8-9021cecf9251/73076041876.pdf
- https://s3.amazonaws.com/bidurudilidujug/the_story_of_rama_and_sita_bbc.pdf
- https://uploads.strikinglycdn.com/files/dd2fc02a-0dc2-4b6d-b36c-8a4ab452b29c/magic_tiles_3_remove_ads.pdf
- https://s3.amazonaws.com/wewuxuviwar/kensington_fly_sheet_with_belly_band.pdf
- https://s3.amazonaws.com/gujutavevive/28243043699.pdf
- https://s3.amazonaws.com/xokebore/ingo_app_download.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_off0000d0ad.bin` `b8ca3a42082f3f3d5910618d9bb57f95f215e0da6e2ca3e71bdf616187976e18`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0AD	5412 bytes
`font_01_sfnt_off0000e338.bin` `477639dfcec9ba84238fd27a9eae7bca2ef272ce8d5726b9efdaf911a4931825`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE338	15996 bytes

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