Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fef4e445b88a900…

MALICIOUS

PDF

62.9 KB Created: 2021-02-04 07:05:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ba6975e5210d7b1a9e758c635a57739 SHA-1: dfaedbf1801018afc7ebafd36b12697f43761b76 SHA-256: 4fef4e445b88a900200054f838d56a74a83051592c7fe6983e3191b67a547bd1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to a poem, likely to disguise the malicious intent of redirecting users to potentially harmful websites.

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
  • 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.
  • 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://maypoin.ru/123?utm_term=a+long+walk+to+water+poem PDF link annotation
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/rukezu-nagewufin-neruketiwixaj-zuxokolajes.pdfIn PDF document text
    • http://sallles.ru/pogumazulio6an3.pdfIn PDF document text
    • http://tk-time.site/productos_notables_binomios_conjugadoszpbqz.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/zobexagom.pdfIn PDF document text
    • https://genezekanoz.weebly.com/uploads/1/3/1/4/131413678/4540014.pdfIn PDF document text
    • http://prostotit.site/can_hit_kill_jireny21jg.pdfIn PDF document text
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/7186224.pdfIn PDF document text
    • https://kasugokadudibuk.weebly.com/uploads/1/3/4/7/134740653/weboro_kuzow_zanujigu.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/MSgjuVC/mowugidasofawenir.pdfIn PDF document text
    • https://nedijevir.weebly.com/uploads/1/3/1/4/131406348/3020632.pdfIn PDF document text
    • https://veworokog.weebly.com/uploads/1/3/1/6/131606039/fevurufoza.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/hbhb7Ql/fipekinelupuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0E 5108 bytes
SHA-256: 7559f6014e62ba727d0a7073426316ed8befd8902f589b9a4140b6972a0a53a2
font_01_sfnt_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 9264 bytes
SHA-256: cb95848507aded14a3a497b9f1b0e87aa03663ee41835f5f05a425f0c827bf24

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