Malicious PDF — malware analysis report

Static analysis result for SHA-256 803c331542f44723…

MALICIOUS

PDF

69.1 KB Created: 2021-02-13 17:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d72a9e0c21d93f85fae7beb2a4addf77 SHA-1: a6374fc06916a60df0cb67f2049a93036d6099f6 SHA-256: 803c331542f447234025fadb53106be4ad652e4e461975b97b746453f2bf0b4c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=harbor+freight+folding+trailer+manual In PDF document text
    • http://allrecipes.pro/lenosuzugebitudafakor8ebhi.pdfIn PDF document text
    • http://gamedv.design/sarutejilufijaxiza4ib.pdfIn PDF document text
    • http://livethailand.fun/tumblr_pictures_macnfed3.pdfIn PDF document text
    • http://checkmyscore.info/refazuzepejabodolezazukh7dxc.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/bukupazurefuvimirawonwwl8.pdfIn PDF document text
    • http://italysummer.space/kozejalikiferawun7dmpa.pdfIn PDF document text
    • http://salea.site/approximation_algorithms_and_semidefinite_programminghsujp.pdfIn PDF document text
    • http://idealica-italiauficiale.website/celestial_bodies_with_female_namesmq3n1.pdfIn PDF document text
    • http://instapriz365.online/nunuderezomegarefo0y3e5.pdfIn PDF document text
    • http://domilajen.22web.org/linux_system_administration.pdfIn PDF document text
    • http://zupubovogigu.iblogger.org/couple_of_days_nigerian_movie_free.pdfIn PDF document text
    • http://kawlites.online/nasanigezemoginazizovukaz7a0kj.pdfIn PDF document text
    • http://thepropheticapp.com/scientology_auditing_questionsrqf7t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ff3820dababa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_600c7c9923ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_600f4b6879318.pdfIn PDF document text
    • http://lidlid.xyz/402857837536d08h.pdfIn PDF document text
    • http://mailedflkf.site/sefizegrzr6.pdfIn PDF document text
    • http://wediwutesifetuw.iblogger.org/dapajapuvakaka.pdfIn PDF document text
    • http://venira.su/jafejiwirolenapotu0nwun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fdb0d754cc9b.pdfIn PDF document text
    • http://fresh-ita.space/rush_hit_singleslbsk3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxewetim.rf.gd/shading_regions_inequalities_worksheet.pdfIn PDF document text
    • http://lipaxunuvevi.epizy.com/47019963341.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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 5244 bytes
SHA-256: 634e2dc7efff224ce0dba6c4cef4df6ae41d1e49d40cd5df38705e7528e7fa5d
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 10488 bytes
SHA-256: 2010a00b06462ced01989f772398db32d698c1ba6a3f8348e14f7ff70f84f322

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