Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f9b259e87bc672…

MALICIOUS

PDF

74.4 KB Created: 2020-12-29 14:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9aefdc85007dc5deeac4ac25c4d16b6 SHA-1: 415519c46c6379ea97aff4c8ed7b9cb39eb55317 SHA-256: 64f9b259e87bc672e1c26345c6a4a11b19989150a0867a07f81d53383aa9ba06
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. This suggests an attempt to distribute malicious content or conduct phishing operations. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://traffine.ru/123?utm_term=old+school+runescape+demon+slayer+words
    • https://memarexegota.weebly.com/uploads/1/3/4/3/134366516/8fa9ab3.pdf
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/kesetibefeputitixum.pdf
    • https://static.s123-cdn-static.com/uploads/4381320/normal_5fc9a4916b4a4.pdf
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/soxulowanur_nanubotos_nosuwunin.pdf
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/2434549.pdf
    • https://pepadamive.weebly.com/uploads/1/3/4/4/134468065/rodagamabonuzej.pdf
    • https://doduvubilomav.weebly.com/uploads/1/3/4/8/134861128/bigukavipubanos.pdf
    • https://dugumali.weebly.com/uploads/1/3/1/4/131437411/10ed93174c9502d.pdf
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/mefiribiluzisaz-ratogodakeveka-jitafogujoxi-lemevu.pdf
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/8486a8d.pdf
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/mezuduzivarunevovowe.pdf
    • https://cdn-cms.f-static.net/uploads/4457586/normal_5fb6b36b28177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d3.bin
601f39836834524454f651d985fac868984ee248948cf2c4d154a8f28b077b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 5288 bytes
font_01_sfnt_off0000eaa7.bin
4c5e2cd1d60be8ea40787ca80f4cf16d845cb1bbdaaaeab85943f21da2ea020b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 10488 bytes
font_02_sfnt_off00010e67.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 4324 bytes

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