Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd83e6ed19acd5bb…

MALICIOUS

PDF

78.0 KB Created: 2021-02-13 22:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 029369b6e634aaeeac7a4b71b077c223 SHA-1: 0efbb570ae8de97db264ef636c015b7a50b6b83d SHA-256: bd83e6ed19acd5bb4f8dd7ced2987491e99218f6b6aae8cc8c1974997be765c7
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were extracted, the embedded URLs suggest the document's primary purpose is to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=fodor%2527s+guide+to+bordeaux In PDF document text
    • https://cdn.sqhk.co/vixonafom/jg9hbjc/48029501862.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/julosubafu-dibizujabezi-movabivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6022238f44436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fe77101d3301.pdfIn PDF document text
    • https://nasokeluvofof.weebly.com/uploads/1/3/1/4/131453401/xelifi-pulofizutevajo-gevutip-bexadisesup.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/Rgcjet9/buvosatisudogegu.pdfIn PDF document text
    • http://kidunotofonaxiz.22web.org/kanazegirovu.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/gjIjin0/mibajevigeg.pdfIn PDF document text
    • https://larofumizedewep.weebly.com/uploads/1/3/5/3/135326757/pegub_joxazisaxurop.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/xhaTvns/survivalcraft_pc_download.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/vibesulijirof-debopapam-suxal-tujewofebi.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jdghj1L/6650712892.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/hKvjfwi/must_watch_movies_2020_tamil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mezezix.rf.gd/meaning_of_postal_ballot_form.pdfIn PDF document text
    • http://sudimomovaw.epizy.com/sat_answer_sheet_format.pdfIn PDF document text
    • http://tisuvelepep.rf.gd/28136376311.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 4936 bytes
SHA-256: 865e9e7aeb2cf19156b2df5b20c1bd1d54b8a934b9a7a57b203f17639527a023
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 10100 bytes
SHA-256: d7237cfaddd498591084be01126a7ac7f5a59a656a64804b72c2e65990443c8d
font_02_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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