Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedb85cb4ff05076…

MALICIOUS

PDF

77.1 KB Created: 2021-02-14 16:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5c7223e0e26ea848a5389e35793497a SHA-1: b7006d0dc1a8d6730bfd7e6071c30564b8eb65c1 SHA-256: aedb85cb4ff050764a75683a4de89887107464776d95517e11bbcd0da7dc54c4
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, many of which are SEO-optimized, suggesting a link farm or content-luring tactic. The embedded URL and the document body text indicate a phishing attempt related to software serial numbers. ClamAV detection and ML classification further support its malicious nature, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/wix?keyword=serial+number+for+adobe+photoshop+cs5+extended+trial PDF link annotation
    • https://xonutupusuvulin.weebly.com/uploads/1/3/1/8/131871786/ffb70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_6028086888a7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodirebimufesa.epizy.com/rokegagogas.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/cbse_net_old_question_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/travel_diary_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/dexter_gordon_cheesecake_sheet_music.pdfIn PDF document text
    • http://budunasetixap.epizy.com/i_m_going_up_yonder_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/age_of_empires_2_cheat_sheet.pdfIn PDF document text
    • http://vonizevugopu.rf.gd/82604386528.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/76256992415.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/free_bollywood_movie_site_for_pc.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_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 5828 bytes
SHA-256: 6b9ef05442abe75966ee70bce2b899086544f7e8ad337e6b1905192dc9df5e4b
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 10308 bytes
SHA-256: c481336fed7665d6da51368be6887cc759aac4f08203aef3aa9adebd1479722b

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