Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4a60da31938d50…

MALICIOUS

PDF

87.7 KB Created: 2021-06-05 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e046e600ba945bc495154d5766b9c9b SHA-1: f357686f2aa13f4df5f33be770677e5cd26ab722 SHA-256: 1a4a60da31938d50544984e16280937caa1d68b371ecbf3c934643ca4e2d976e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting services and link farms. Heuristics indicate this is a link farm on disposable hosting, with a high ML score and ClamAV detection confirming maliciousness. The primary attack pattern involves directing users to potentially malicious external sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://synerhu.ru/pbw?utm_term=quando+usar+onde PDF link annotation
    • https://vazewelekataba.weebly.com/uploads/1/3/1/6/131606588/ea18b0293596391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6055ce5be8c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_606668bfe3ade.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/vuwojosetozidosuga.pdfIn PDF document text
    • https://kugatovobubusub.weebly.com/uploads/1/3/4/6/134680339/zozelenanoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_6056f43e182c4.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/dawugekovu_pufejemomulujob_dimekiruravaxo_vijalepuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fda8d0a4b82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6068a5aa75b4d.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/9c07738bf09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibosini.pbworks.com/f/free_24_hour_schedule_template.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/f/33962598813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9892e9b5-2108-4630-8454-48adb8c0c02f/tigudaka.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/old_hindi_songs_collection_zip_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610c10da-29ed-4230-b7c4-72ba6e5f92e9/80722528052.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144461979/how_to_check_pregnancy_with_pregnancy_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b862bdaf-0c69-4ad1-aac8-7a3c33457067/gezinavekijuji.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/66878021473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0539364b-4e63-4729-bf99-9192c939ebcb/still_alice_trailer_english.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/chapter_3_lesson_1_homework_practice_constant_rate_of_change_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08080300-a0ce-4ac2-b78f-40e14be29561/an_introduction_to_modern_econometrics_using_stata_free_download.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_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 4848 bytes
SHA-256: 88ff868cfa4129259521b4354894923f39581ed85119088abf91ab53b8a7abf5
font_01_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 12952 bytes
SHA-256: 5828eea943624244d06c64d4fd2c34234b06582d2d18309aead20e18dcf0038a

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