Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63e5276f71a6083…

MALICIOUS

PDF

67.8 KB Created: 2021-02-22 01:09:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 86d6979e47ca0ef07b735df5c82908d1 SHA-1: 9524bf986dc82753ba8a2522cc5a4f1f96137bab SHA-256: d63e5276f71a6083ff8acd44437596f567aedbb5c411ab981cd36fd53b90f894
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The presence of 'cMdshb/wojezavaniwasoluwib.pdf' in the document text suggests an attempt to disguise malicious links as legitimate files, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/strik?utm_term=2004+yamaha+yfz+450+carburetor+diagram PDF link annotation
    • http://tajavimisafom.22web.org/border_song_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5ffb0b3176af2.pdfIn PDF document text
    • http://walojafaj.iblogger.org/job_application_form_sample.pdfIn PDF document text
    • http://tinivoze.22web.org/dodidizuzizugogil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5fe2638178ba3.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/lNO5ghg/46501732525.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/hcMdshb/wojezavaniwasoluwib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5fdc01720da69.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/GHhdhjU/bass_booster_youtube_pc_windows_8.pdfIn macro / runtime command snippet
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5fe33dfa15717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60322039ab80e.pdfIn PDF document text
    • https://cdn.sqhk.co/nupodamukoji/Zariigi/bricks_shooter_strikers_1945_plus.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/xogaperezejofiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://desetezovadu.epizy.com/densetsu_no_yuusha_no_densetsu_episode_guide.pdfIn PDF document text
    • http://lugetobuzisufa.rf.gd/english_book.pdfIn macro / runtime command snippet
    • http://xepododulujex.epizy.com/dasesowusu.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/terraria_expert_mode_eater_of_worlds_guide.pdfIn PDF document text
    • http://poketiwuk.rf.gd/mudekozedudax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5B 5684 bytes
SHA-256: 54da4a482c1b625cdebe057404343bb595cdbb4228ef16b3da52e10bba8ba030
font_01_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 10236 bytes
SHA-256: c341160a4204f8aa591b0231a5c7bc8e29de4865c18143a5c33977bfe0fa60a1
font_02_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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