PDF malware analysis — malicious · ee7feff55c395cec

MALICIOUS

PDF

72.7 KB Created: 2021-02-28 22:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fc00cfec8bc6ca96c492cf9391eb1472 SHA-1: a7dd9261753fed9bd18aced8c7205264beab4ded SHA-256: ee7feff55c395cec76f92934c73556a5746669a1115654bbc9ef24424d5318bc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for link farms and phishing campaigns. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or spam distribution mechanism.

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://pelibifir.ru/123?utm_term=how+to+remove+hard+water+deposits+from+swamp+cooler
- https://lipuguxe.weebly.com/uploads/1/3/0/7/130738524/1933281.pdf
- https://degetopej.weebly.com/uploads/1/3/4/7/134727915/9823156.pdf
- https://cdn.sqhk.co/lobinazema/shjggHy/8932368532.pdf
- https://cdn.sqhk.co/zajagatetode/ihBVgj0/mafusenapor.pdf
- https://cdn.sqhk.co/didowaba/Naohit9/popular_hashtags_for_instagram_landscape_photography.pdf
- https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/wopoz_rebef_jotub.pdf
- http://fastnoutservice.ru/gifafoberumugukexudg2.pdf
- http://temilops.xyz/census_of_marine_life2aw12.pdf
- https://cdn.sqhk.co/bojojiweg/igjgdkF/mekerarejavu.pdf
- https://cdn.sqhk.co/guvevifowo/jvIWok2/2017_f150_super_snake_for_sale.pdf
- https://nudegono.weebly.com/uploads/1/3/4/6/134682657/9875ff108e.pdf
- https://mogudigadoto.weebly.com/uploads/1/3/2/6/132695399/5357661.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://dejedizanabi.epizy.com/blank_guitar_chord_sheets_printable.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_off0000e103.bin` `60b29bc2b78043812218cafed2413af58ed0a5ef562cb607e49ce5cb4dc5eb24`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE103	5508 bytes
`font_01_sfnt_off0000f3a8.bin` `d9d701f306b9238e52765ee7809fa2a4eaed72626a1b6ed66c9be19d19c6932b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A8	10040 bytes

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