Malicious PDF — malware analysis report

Static analysis result for SHA-256 283de28f969b7530…

MALICIOUS

PDF

74.6 KB Created: 2021-03-13 23:03:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1cc54be47c13fe0207800fdf1f037d28 SHA-1: 879623103df25215c9f8dc8f0166600df69a1050 SHA-256: 283de28f969b7530537cc721e2567ea82e6bee1c52da00a837f08a644f16899d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing operations. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=graphic+design+university+new+york PDF link annotation
    • http://inglassrus.ru/40388230235mohff.pdfIn PDF document text
    • http://mynasert.online/5002260227161g7f.pdfIn PDF document text
    • http://nat-fru.space/38542004967kq5kp.pdfIn PDF document text
    • https://zexibimugurarem.weebly.com/uploads/1/3/5/4/135400238/papunatuti.pdfIn PDF document text
    • http://vawifasu.22web.org/bufibek.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/82913274797032yl.pdfIn PDF document text
    • http://faxoburoxiba.22web.org/what_is_the_purpose_of_projectile_motion.pdfIn PDF document text
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/16dadc0f8a8f.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/e8394d1.pdfIn PDF document text
    • https://fifuvifelikedub.weebly.com/uploads/1/3/4/6/134662232/baxurozilunaza.pdfIn PDF document text
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/jotidivikoxigozot.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/rgcghif/cheap_skate_jeans_womens.pdfIn PDF document text
    • http://maxist.ru/dunkin_donuts_couponsw6gjv.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/7b4bffbb40d.pdfIn PDF document text
    • http://prizinsta24.space/21565076177goibz.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/bjbTJhg/bolejataraxazifebupukegi.pdfIn PDF document text
    • http://bella24.xyz/34231668843qkf8f.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/iKeVyz0/gesinumumagad.pdfIn PDF document text
    • https://kawuwulaf.weebly.com/uploads/1/3/3/9/133987507/2f33bc.pdfIn PDF document text
    • https://cdn.sqhk.co/gutipefu/Hpgchcl/52540813655.pdfIn PDF document text
    • http://santaparker.store/189079653432a0pa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japimokenixovip.epizy.com/50462420563.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/baby_boy_crib_sheets_canada.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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 5652 bytes
SHA-256: 873dc47b45518218015f773bd7c3236db246104dfde4e83576b2bba0e84cc33b
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 10572 bytes
SHA-256: cddfa805c9229b6a8958e539638b6cdf82812f8258fa487902638d13425a5f02

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