Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d3f936ac562da…

MALICIOUS

PDF

71.3 KB Created: 2020-11-13 01:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56f6661a818162fdfb06c9e0fdfe4c0 SHA-1: 7762347a12fbf50d5f4c6c5415082447b9d23bed SHA-256: 921d3f936ac562da00ebbf729560dfda72473b1051e31e8dfeb828230e2c2072
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 SEO poisoning and phishing lures. One prominent URL, 'https://traffnew.ru/strik?utm_term=real+estate+investing+for+dummies+pdf+free+download', suggests a phishing attempt disguised as a free download. The presence of ClamAV detection and ML classification further supports its malicious nature, indicating it likely serves as a dropper or redirects to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=real+estate+investing+for+dummies+pdf+free+download
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/kalikegisetud_kanewujejixori.pdf
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/kemapolerimerem-gasatoronuzigo.pdf
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/26090c657ba8c1b.pdf
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5f9d38c10b476.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/de699a4f-168e-4c43-b2ed-47dcf323501f/telokat.pdf
    • https://uploads.strikinglycdn.com/files/23c2790e-7260-413a-b145-96a2a06fd125/27678157014.pdf
    • https://uploads.strikinglycdn.com/files/eb9d0b29-af2d-4c25-9ae6-8125e0fc998c/gitowenipepubu.pdf
    • https://uploads.strikinglycdn.com/files/4c2010e1-e1b3-40d8-935f-7cc4f24452c3/mesugixisivijenidiwo.pdf
    • https://uploads.strikinglycdn.com/files/cea1ebe3-9aed-4a37-8b13-64e0b333ad28/user_guide_toshiba_satellite_laptop.pdf
    • https://uploads.strikinglycdn.com/files/7f49354a-9008-436a-a97e-33f76de8dab7/5515018447.pdf
    • https://uploads.strikinglycdn.com/files/0ab15be5-634f-4ea5-b7e4-716746ba826d/mario_theme_song_clarinet.pdf
    • https://uploads.strikinglycdn.com/files/18010fb8-691d-4b9b-b9cc-e190786583b6/mikigofifesugez.pdf
    • https://uploads.strikinglycdn.com/files/13c49081-4c75-4c93-975f-a76bf936d3b8/lavosobej.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.

FilenameKindSourceSize
font_00_sfnt_off0000d9f0.bin
3cc4fe29a56e9f518ccf59ad2204d0956872c6e0a61b1913da41aeb46c532198
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 5520 bytes
font_01_sfnt_off0000ecbd.bin
8b2e2973ac8f84702cdc0899f7921d65e6c8cf1670d617ac23a5188320e41473
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 10212 bytes