Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d1c206e4ea8621…

MALICIOUS

PDF

75.2 KB Created: 2021-02-17 21:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c98f3821b5e58fbf070c8cb1d1b5b98 SHA-1: 5df5b061635a99fee0fe75723e5c6205e1bee018 SHA-256: 99d1c206e4ea8621390451d918d67254103b071ece9f22421a5db925a99343fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution vector.

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://jacksth.ru/strik?utm_term=craftsman+gt5000+manual+transmission
    • https://cdn.sqhk.co/puwipaneke/iYnjbc1/infection_board_game_rules_template.pdf
    • https://cdn-cms.f-static.net/uploads/4369506/normal_60126bc56a3e1.pdf
    • https://static.s123-cdn-static.com/uploads/4366305/normal_5fe0d7dcceb77.pdf
    • http://fefafumevi.iblogger.org/dinoroduv.pdf
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/506182.pdf
    • https://static.s123-cdn-static.com/uploads/4420029/normal_5fe01b263ef40.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5fd85abed607b.pdf
    • https://cdn.sqhk.co/wadelovelo/RjehbZ1/new_cartoon_movies_2018_full_movie_online.pdf
    • https://static.s123-cdn-static.com/uploads/4385847/normal_60098ecf8464d.pdf
    • https://cdn.sqhk.co/wejagamewo/3kjb4ib/38554082185.pdf
    • https://cdn.sqhk.co/rifarako/Vi6uhbG/fotipanibonaxidabekozakut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zuniguvip.epizy.com/english_worksheets_for_class_3_icse.pdf
    • http://pugasixowofizij.epizy.com/formulierung_absage_bewerbung_nach_vorstellungsgesprch.pdf
    • http://kixexagejo.epizy.com/ice_cream_instrumental.pdf
    • https://s3.amazonaws.com/tutapaxi/widideperixeri.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_off0000e9b9.bin
865c20e59a50d09fbede48ece8f7bdcb9410b18f978556d1a17d1571ac28081e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5260 bytes
font_01_sfnt_off0000fb82.bin
b39a2dfc7f8809b282b895abd580d678f35fa9e83116b51e21ca57bd9a5d4c29
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 10616 bytes