Malicious PDF — malware analysis report

Static analysis result for SHA-256 32aa3de3e28483b0…

MALICIOUS

PDF

122.4 KB Created: 2021-04-13 08:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd92f5ed01e7c0e31f0c377524fd272e SHA-1: aaac8a19fb1838b0cd2d7b359af5be3b60aab605 SHA-256: 32aa3de3e28483b0970c934cbafc9c8946dafa4cc21d3e8cd22f9aedb5584546
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://golowaki.ru/strik?utm_term=what+is+the+best+125+pit+bike PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ff51d6ecd7df.pdfIn PDF document text
    • http://tijatanilipe.iblogger.org/pizowixemovosukuvemajo.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/HpifFjd/left_4_dead_2_mod_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/hjagfeN/bowmaster_descargar_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_600ffae618834.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475392/normal_60011c646b21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_601673d35b7df.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/biserial_and_point_biserial_correlation.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/iLGjgLr/revanolepaf.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/bosch_silence_plus_error_code_15.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/jb9Rjbe/plague_m._o._d._android_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_b020608232f84aa48c3e7a136b8e7f57.pdf?index=trueIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_5eea50b749af48a6858db91889de6929.pdf?index=trueIn PDF document text
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_294bc2569fb6449a920d151b4659a4c0.pdf?index=trueIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_c2d8fe0127f04c21bbbef7aa1a3d7b76.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_cbd90555a7d34cca8be4652b92cf732e.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_4386f0a85313408497803bef552e22f7.pdf?index=trueIn PDF document text
    • http://pajamenu.rf.gd/2006_honda_civic_hybrid_engine_for_sale.pdfIn PDF document text
    • http://guputawa.rf.gd/88468585410.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_12c284deceb3442d96fc875086a632ca.pdf?index=trueIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_8470b017f6af44ef9749c33cf7f1ebfb.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_f83ed09243994070a0390a81cceeade0.pdf?index=trueIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_8fe5290f2705493cbd5909583a60d935.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 5304 bytes
SHA-256: 39f290bcf9551bb30adbd6faef5fa10f7a8b78f81478c0ae479db24cb19e9071
font_01_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 27984 bytes
SHA-256: 8f5177aae03d20fb1acae7c4a482e81dd1003a4f4473909fdc0a3e053319a188
font_02_sfnt_off00018501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18501 11160 bytes
SHA-256: fbed248453447f745cc97ebb0ffb7179e00585976251076d03d4eb9e661d45fe
font_03_sfnt_off0001aa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA79 30788 bytes
SHA-256: a791d386d895251b2cb2d18a425820fafb04344f541b23944fe1d053475a4690
font_04_sfnt_off0001d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3E2 1772 bytes
SHA-256: 118aa30c17fae0196f68096453e020590b154bcdf1fe4424f9eba7a3a17cecdf

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