Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a73e3c8b37954ce…

MALICIOUS

PDF

120.0 KB Created: 2021-02-15 20:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a702427bdff6bbd352e0629a9d03fe1d SHA-1: 6d4c1d064cde61a1c723b5008e97d249f470cd98 SHA-256: 1a73e3c8b37954cecc1eabfc34a068144f1f083f9c6b0d3bc58c3aebae6e2f02
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this document, indicating it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=vx-7r+vs+vx-6r In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_60011e495eb1e.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/gShhifP/29731903774.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/b1niauZ/stillwater_ok_golf_courses.pdfIn PDF document text
    • https://cdn.sqhk.co/nutakurij/RRrPCyw/1054661159.pdfIn PDF document text
    • http://graatorama.space/37891824265gemgd.pdfIn PDF document text
    • http://gachihyper.xyz/kufapalusabossdb4k.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/ketagodid.pdfIn PDF document text
    • http://muvibigi.22web.org/sovinugigali.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/1FBCndw/bike_mayhem_mountain_racing_premium_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rebamasisagu.epizy.com/combustion_reaction_chem_worksheet_10-_5.pdfIn PDF document text
    • http://gekavitominugi.epizy.com/bible_old_testament_bangla.pdfIn PDF document text
    • http://timavutiziv.epizy.com/bland_diet_food_list.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 21040 bytes
SHA-256: e7da7d7d1cb2766d785cb5d5f1e2e6bdd912bce76070c68cd186be19380729f1
font_01_sfnt_off00017cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CD7 4796 bytes
SHA-256: 6bf19df9acb7769f8bf150a987c1cecdbfa278a46fa4d5ee7f7a5904046138d1
font_02_sfnt_off00018d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D52 14484 bytes
SHA-256: c8bb9eb82b438d01328bc0ed7298a8d28edbff502d7607aaddca33ba78a16d69
font_03_sfnt_off0001bc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC3F 16068 bytes
SHA-256: d7b25dc5f512836eb4e96674031d2352042d4610eccc34473d5b6aff049d846c

Open this report in the interactive analyzer, or submit your own file for analysis.