Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b217044a3414602…

MALICIOUS

PDF

70.7 KB Created: 2021-04-05 05:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81ce109f3bdae478cb2e7516c17ae72f SHA-1: 723f28cbc3803f565e6f134a279b33121b69af0c SHA-256: 1b217044a341460283a7f7b3d15b880f445874b835b72da7c86876c4765d37d7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=joyous+celebration+22+amagama+medley+song
    • http://jepisafidezegun.scienceontheweb.net/iowa_state_university_campus_map.pdf
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/4fd13f6c1fa235.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/25652b7b99.pdf
    • https://wipugetawunuw.weebly.com/uploads/1/3/5/3/135302850/fa5f3b4c5a2c83.pdf
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/zojozilofi-kutozit-nomavobuz-lipar.pdf
    • http://vixabaj.scienceontheweb.net/texubagepabekerogefiz.pdf
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/1932378.pdf
    • http://timinome.getenjoyment.net/govejapar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zepuwiz.atwebpages.com/92499651718.pdf
    • https://ff5d1526-1eb9-447d-8915-67ca9933f1b4.filesusr.com/ugd/9565fd_7705ed760247419b9e1e53c300e23f24.pdf?index=true
    • http://dowuvoduwitovos.atwebpages.com/ecological_footprint_case_study.pdf
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_a4176c6c484e4173ace5ed8765607669.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_11f11e8bce55475eb4e63fde3b7d2d29.pdf?index=true
    • https://s3.amazonaws.com/wemofodi/80255336227.pdf
    • https://s3.amazonaws.com/dozore/jawazuxeriwafapamojove.pdf
    • http://doxokalisawe.myartsonline.com/the_owner_s_manual_for_the_brain_free_download.pdf
    • http://xotaferuju.myartsonline.com/xafuwoniripupatasuxux.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_off0000d2eb.bin
71c8249c91f761e4e9160d541db3dae64a7a6c89165a2a689320774e05c6504c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 5620 bytes
font_01_sfnt_off0000e5f3.bin
fc6ff8339f3a9814522477b20f1ad918c30876ab31c3be2b842fdfc8f84e9993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 11104 bytes

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