Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0ffdf83bf1e110…

MALICIOUS

PDF

67.3 KB Created: 2021-02-11 21:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: be74f47eaaca93e67239c1776e32c136 SHA-1: 1dfada83ad5113347d0bb920e6816824fae6a3ba SHA-256: ac0ffdf83bf1e1103a8662cb33424f685fcc94a0776e58bd5306e9c77c011405
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified this as a phishing trojan. The embedded URLs suggest the document's purpose is to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wb?keyword=intellij%20import%20formatter%20xml PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5fe158ff59b1c.pdfIn PDF document text
    • http://itdomen.fun/abyssal_commander_sivara_heroic_tank_guide9zlpy.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/ehgohi5/43494932112.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/jcsyiiI/47019902930.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/ihU81hg/software_data_cable_for_windows_10_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/gfjg0s7/slimming_color_block_dress_blue.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/k4ghomr/nerewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fe929e4f0bbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fc841b560045.pdfIn PDF document text
    • http://fefikaniki.22web.org/mumilivuwazid.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/7298662.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://banamuf.rf.gd/fiximala.pdfIn PDF document text
    • http://xoxasosopu.epizy.com/wizilavetexigivulej.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/gobupewugenutefimevefobid.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/10340728565.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 4952 bytes
SHA-256: 15b382fbd6b0e003b3a1016a0968c58187600a1d8e0c3f3d4474552ab0ab4e68
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 10200 bytes
SHA-256: 42ce7c2de2c81b6d46c64ada3b5728e6ebfb58622fd34feb0a699806d7337794

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