Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecfb04df44eebf9…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4da3bcc9503a1c8055441ef1d28631 SHA-1: ad5d74960756266acee4d7fb4b700134fdf434ef SHA-256: 7ecfb04df44eebf9050744a89d7af16ea53fcc279690835d91187c6d887ae64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards the document's primary function being to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=spirit+e+310+weber+review
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/a7360b51b9.pdf
    • http://car-den.ru/5737427169501mnz.pdf
    • https://cdn-cms.f-static.net/uploads/4460251/normal_60337ecc70ee4.pdf
    • http://simcars.ru/moviestarplanet_apk_mod_moneyoh4r6.pdf
    • https://cdn.sqhk.co/waximanodif/giigqtb/86862395323.pdf
    • http://bit7.top/91163122388ul21e.pdf
    • https://static.s123-cdn-static.com/uploads/4418192/normal_5ff0b0f85c968.pdf
    • https://cdn-cms.f-static.net/uploads/4459624/normal_602e535a4d975.pdf
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60607bafd7502.pdf
    • https://cdn.sqhk.co/najafizox/hdijFXo/poker_world_mega_billions_app.pdf
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/8929425.pdf
    • http://rbqjkwklnd.xyz/how_many_calories_in_one_taco_bell_saladtif0o.pdf
    • https://cdn-cms.f-static.net/uploads/4381531/normal_606c60b2eeef1.pdf
    • http://pubgmobiie.com/how_to_reset_toner_counter_on_brother_printer_mfc-7860dwubo6q.pdf
    • http://dmdmassage.com/999661962678t264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000eafc.bin
a3357ad0eb4cd1c740a407d617e4d975d4c5af7606b89db20d7a7900db1ddf84
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 5148 bytes
font_01_sfnt_off0000fcb3.bin
37c2b5c27a5b7a8c9ebb43edf4e1dc64c6f98738051b175eb0bfce29153beca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 11132 bytes