Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed02ea56c24c293…

MALICIOUS

PDF

72.9 KB Created: 2021-01-16 13:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 927db2e6b9dec2fd1a43a9176ecfb070 SHA-1: 4f75b2e06f16d141b1c40aaa42db2613151683ac SHA-256: aed02ea56c24c293ca3d02b2ac46cbfd187b90bd42e29d604564b445147cd64c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to "Readability statistics google docs" and "wkhtmltopdf", likely serving as a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=readability+statistics+google+docs PDF link annotation
    • https://cdn.sqhk.co/fexilejedit/hjviaje/nejobigosizisokexeraso.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/r4nMWja/sesofegukumasivowupit.pdfIn PDF document text
    • https://xawazexeresav.weebly.com/uploads/1/3/4/5/134527443/texikutebumo-dovepu.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ftighae/sausage_jump_fun_adventure_running_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/zyjj77D/lasers_retirement_forms.pdfIn PDF document text
    • https://site-1178883.mozfiles.com/files/1178883/biwalajuxe.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/51f3181fea7.pdfIn PDF document text
    • https://site-1177369.mozfiles.com/files/1177369/58821540870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satudifin/context_clues_3._7_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/79286372315.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/a_b_s_ki_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/pltw_computer_science_1._3._5_answers.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 5260 bytes
SHA-256: f5f844fec920928b3d8b96201b7b7262d40e4f5c7d27a02487ac89ae3830b160
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 10288 bytes
SHA-256: 5f381b82920e40cf3af8822312330980d09ddf8955e6bfa42728a2605c32ea4a

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