Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea975c8d5cc4a3f2…

MALICIOUS

PDF

78.0 KB Created: 2021-06-09 20:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf61bdf96e09a225315a051947cd6cb5 SHA-1: 4006747d7e1478a2aa9d99953f220e46ee250cda SHA-256: ea975c8d5cc4a3f2f8fc15c971bc230a3c419947a58339ddddf6b3344a721ef0
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL, 'https://coretry.ru/pbw?utm_term=hack+version+of+plant+vs+zombie', suggests a lure for a game hack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=hack+version+of+plant+vs+zombie
    • https://cdn-cms.f-static.net/uploads/4449422/normal_60baea10c6282.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_6017aa4bd78ed.pdf
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5fd7ee825d026.pdf
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/vaveboxikulimetujir.pdf
    • https://rogapasutidubu.weebly.com/uploads/1/3/1/4/131438129/ligupuduwaxu.pdf
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/8278370.pdf
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/51932ce28574bb.pdf
    • https://tufibexewati.weebly.com/uploads/1/3/4/5/134583298/mufukatasovasov_vetevojuv.pdf
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5ffdd3f7e4d2c.pdf
    • https://zibozofebar.weebly.com/uploads/1/3/0/7/130740265/zaperirebox_kajizibijiti_mupojilijudepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144604062/blades_of_brim_hack_download.pdf
    • http://tazijebep.pbworks.com/w/file/fetch/144419616/21294455551.pdf
    • https://uploads.strikinglycdn.com/files/d3b27485-2ad5-457f-b795-f6d0f5d9a309/31154131523.pdf
    • http://dawanitapix.pbworks.com/w/file/fetch/144872208/83320599163.pdf
    • http://jopamedet.pbworks.com/f/how_much_can_a_ford_ranger_tow.pdf
    • https://uploads.strikinglycdn.com/files/08745887-118c-4da1-a35b-599af55e7fe1/70550042400.pdf
    • https://uploads.strikinglycdn.com/files/d5eae15f-067b-4ffb-a0ce-53bad6ced3f8/xukevip.pdf
    • https://uploads.strikinglycdn.com/files/7b622bf4-2d71-4190-9d69-b5e968373d35/13286816252.pdf
    • https://uploads.strikinglycdn.com/files/6b85dba2-63e7-491e-863c-cd4a17062a06/harry_potter_half_blood_prince_book_release.pdf
    • http://gatunam.pbworks.com/f/214155874.pdf
    • https://uploads.strikinglycdn.com/files/4a139fea-9f87-484a-8e52-ad602900ba24/soundcraft_ui16_multitrack_recording_update.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d8.bin
23a442f98495b29dab5760f5fd15ab9921245b7990dee08eba85ab8532976412		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 5224 bytes
font_01_sfnt_off0000f685.bin
e90837aea8e4f06744a6aba80d3c1d91741ac14b941c6f4bc2eecbb4733da6e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11120 bytes
font_02_sfnt_off00011c17.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 4324 bytes

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