Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6d71bbb9f81692…

MALICIOUS

PDF

74.4 KB Created: 2021-03-01 03:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b4314ad3dbe2191eb948741a71bbe42a SHA-1: b581a26da58713ffe7ca106ff2e021a32f87c892 SHA-256: 2b6d71bbb9f81692d0fdd9cac2fd9698dc5ce28a09be3636d75deeed9e87e572
134 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting leading to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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 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
  • 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://kuzutuzo.ru/strik?utm_term=big+green+egg+turkey+stand PDF link annotation
    • https://pimefukidipobe.weebly.com/uploads/1/3/4/0/134096137/mopitudekepoju.pdfIn PDF document text
    • https://vujirazezada.weebly.com/uploads/1/3/2/6/132681664/ribilorep_gapibugukakava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_60129abc364c8.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/fefesilixutiluzxmee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_603c231a07b1b.pdfIn PDF document text
    • https://kukatuvitakutir.weebly.com/uploads/1/3/4/6/134690336/gejabotejediza-tovilolujo-nudotasajaw-janipogotave.pdfIn PDF document text
    • http://xrootunited.com/windows_activator_for_windows_7_freemw7d1.pdfIn PDF document text
    • http://govnosiakxws.online/line_6_pod_hd_300_patches848xs.pdfIn PDF document text
    • http://idealica-ituficiale.website/tezobibimixitop1mps1.pdfIn PDF document text
    • http://runivofo.iblogger.org/osrs_ironman_armor_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/ffxv_episode_ardyn_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/59826684783.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/79075648674.pdfIn PDF document text
    • http://dozonox.epizy.com/can_i_make_a_smoothie_with_just_fruit_and_milk.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/robusuduvebojegitafapisi.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/ayahuasca_purple_grow_guide.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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 5176 bytes
SHA-256: 847e9064ae95d3bd7b2a77a02eb2eb1bcf6d73fd640f973dba32835daed45e2e
font_01_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 10704 bytes
SHA-256: 4f4be6f70fa08a830a1f43aea06cbe2ee84e6d5805d8595270e96b081d4a209b

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