Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef896987e15f4d8e…

MALICIOUS

PDF

65.4 KB Created: 2020-11-14 13:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82cecf208e4761875b16b887f4b7d475 SHA-1: 5d65506bb6099b909956f950f8535a1debf9a3d9 SHA-256: ef896987e15f4d8e7445a5069b1e9e3b14b6ab1f8967983e7249cef4030fa01f
252 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on disposable domains and point to redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'free service manual downloads'. The presence of a malicious redirector link and a high ML classifier score strongly indicate malicious intent, likely to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?utm_term=free+service+manual+downloads+pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/gavifubutugut.pdf
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/wapefilipubareb-golonogujizepi-gegite.pdf
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/5409844.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdf
    • https://cdn-cms.f-static.net/uploads/4372101/normal_5f910e481e36e.pdf
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f90cc4c88960.pdf
    • https://fujamimoxelak.weebly.com/uploads/1/3/4/6/134601663/7f6e501a8e.pdf
    • https://cdn-cms.f-static.net/uploads/4413007/normal_5f9e7f249e9e6.pdf
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f94995d1-f1c5-42d6-89f6-71b3eef09064/67847259281.pdf
    • https://uploads.strikinglycdn.com/files/7529aa68-1c35-4232-a59c-041564932db8/gulazuwovi.pdf
    • https://s3.amazonaws.com/nuruvapozixix/snapchat_mod_apk_no_root.pdf
    • https://uploads.strikinglycdn.com/files/b597ab9c-3ba2-45f9-ad3f-75c68cc23e21/busofelivugafizetigapivew.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d5.bin
ead1f624e0a48e1df781f32f1da803baa85884e4500715b12db5063c1378a8c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 5408 bytes
font_01_sfnt_off0000d738.bin
87780cfb817ebec5412689ebb0b2a9f251d97a447809d3be1f834e8e81525aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 9880 bytes

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