Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abb091b1eb973c9…

MALICIOUS

PDF

117.3 KB Created: 2021-03-31 19:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9afc0fbc593cc4eaf78cb107537f3773 SHA-1: ebd15c9df75cd1c40dbb3842e67ebd57cae1923f SHA-256: 4abb091b1eb973c9cc50c91546adc171a74bd3d5465e42b75f809972ce020f50
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable hosting, suggesting an attempt to redirect users to potentially malicious sites for phishing or malware distribution. The document's content is minimal and appears to be a lure to encourage clicks on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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.
  • 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://kuzutuzo.ru/123?utm_term=bibtex+misc+format PDF link annotation
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/88738f61b.pdfIn PDF document text
    • https://cdn.sqhk.co/latusetime/Doggcha/sound_effects_library_adobe.pdfIn PDF document text
    • http://brumbum6.xyz/49456620019xk6ga.pdfIn PDF document text
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/523090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60366940e5768.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/igcAjgN/juzoviz.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/recorder_sheet_music_easyqa33o.pdfIn PDF document text
    • http://pribor-poverka.site/nubaxejozipojami4enge.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/aEPjjgP/32836894214.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jhibicu/36412353385.pdfIn PDF document text
    • http://domainlimax.xyz/rudin_real_and_complex_analysis_solutions_chapter_3kbg6v.pdfIn PDF document text
    • https://rasiguxi.weebly.com/uploads/1/3/5/3/135314707/rozaxatukapubi.pdfIn PDF document text
    • https://cdn.sqhk.co/dilujuzaga/jUr7Shg/how_to_sharpen_mower_blades_without_removing.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/giibgfD/elune_tier_list_november_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hcFlGja/19441368995.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fTnn4ja/real_bike_racing_game_y8.pdfIn PDF document text
    • http://stakingyfi.com/karcher_k2_pressure_washer_not_workinglciup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_603bb33543de2.pdfIn PDF document text
    • 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
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_0770ed27850c4a84a65dcab8e7869c6c.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_1e887fd0b7274e78aacd886136b46a17.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_fa63774d57c74083b672a684e9ae45a1.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_031b7c1cb0d44885a52151fc824ed9cf.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_da6bcff552364850be4ce3935b43c5f3.pdf?index=trueIn 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_off00017c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C05 4932 bytes
SHA-256: 480b917e895d7041dd0d591ba9b26460fb75b3cde794d7777f7000a90e660850
font_01_sfnt_off00018cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CCA 13252 bytes
SHA-256: fccd51cd9157847c9ae3bc311ca0a44a535c5345665177a2f6b0252612131170
font_02_sfnt_off0001b940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B940 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e