Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec79894d5b9c24be…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 15:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 35f44f1857ed411e045ef59d296de39d SHA-1: 72d49947d72d4346a7c151715b3a3e1995c90c3c SHA-256: ec79894d5b9c24be034ab554260b91c811d186f8ed7a8e115b1029c2e1d55205
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware delivery attempt.

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 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://seumenha.ru/award?keyword=sigma+1009+sts+bike+computer+manual PDF link annotation
    • http://gmetry.online/pamowumetopijexilekubut6fxc.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/f3ijTid/mega_man_mobile_free_download_apk.pdfIn PDF document text
    • http://liketime.fun/798093420855zgy9.pdfIn PDF document text
    • http://lazerepil.site/98563245411gtwtb.pdfIn PDF document text
    • http://tugrull.com/bujikakoznti5l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5ff138e99301a.pdfIn PDF document text
    • https://cdn.sqhk.co/jenexovu/jhzTigT/color_switch_happy_wheels.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/k5vvDjc/mazifi.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/qhcjb7L/nobija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_60282d52653dc.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/9DgGjj2/kugib.pdfIn PDF document text
    • https://cdn.sqhk.co/xurunesijud/uDwkgdh/kumorakixug.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/anarchism_what_it_really_stands_fortt73g.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/e07Pgjb/family_cruise_deals_december_2020.pdfIn PDF document text
    • http://watulexop.iblogger.org/warm_bodies_trailer_english_subtitles.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/zjcgejc/ultimate_one_direction_quiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484118/normal_6008195739aee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebasadalo.epizy.com/reading_plus_answers_level_l_and_m.pdfIn PDF document text
    • http://zupupizejegujun.epizy.com/weekly_weight_loss_tracker_template_2021.pdfIn PDF document text
    • http://molopafefo.rf.gd/tibibijesolerigababo.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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 5908 bytes
SHA-256: 63cfa1962ff2f8e62c19e96aa3dc3d74d34d36b004630558f47f3869c8ed2992
font_01_sfnt_off0000f953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 10716 bytes
SHA-256: fa52fe6b386334ba4e0738858ca43a6664495cdbbb39b82a0077033277a13170

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