Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc68e70eee6f209…

MALICIOUS

PDF

74.6 KB Created: 2021-06-12 08:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55b84b10c64e0c9b2c9c5fb3415ca5af SHA-1: 3d4a613e746ee6dfd27b50f8093e4a2a56f7dd3c SHA-256: 6cc68e70eee6f209202a95f7b47fca883e769b6053e0a8b9f1f84147a8b4c43e
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 pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external sites, likely for malware distribution or phishing, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=bajrangbali+full+hd+image PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501201/normal_60673099abf5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5fd818a5cd822.pdfIn PDF document text
    • https://futifure.weebly.com/uploads/1/3/4/5/134593609/c86d163100.pdfIn PDF document text
    • https://rojujajaz.weebly.com/uploads/1/3/4/7/134727345/e871f7cd9.pdfIn PDF document text
    • https://ruzetutenu.weebly.com/uploads/1/3/4/6/134633181/080fe4b9.pdfIn PDF document text
    • https://fejawizekojiwi.weebly.com/uploads/1/3/1/4/131438151/8901863.pdfIn PDF document text
    • https://togoritireso.weebly.com/uploads/1/3/4/6/134619717/f276212.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
    • http://dumajimov.pbworks.com/w/file/fetch/145046109/kms_activator_for_windows_10_pro_64_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd7aa2b-e417-43be-9b0d-a2ee028fe9ce/how_to_build_characters_in_marvel_future_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0a1425-9901-45f1-95a5-3af592629b00/sadotibozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7f523c-53d5-42ad-aff1-dbd04361475c/74589557762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8bbfe2-5f8f-46a8-9a71-eea29391eaf7/2017_capital_loss_carryover_worksheet_1041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dfd6b5-9c43-474c-a75f-dd7b74bb901c/vopulavovala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edff99df-4e22-4a31-9342-5271d5f46147/troubleshooting_pressure_washer_soap_injector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb676ef-d376-4267-a904-ad27a7911f31/oster_turbo_a5_clippers.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/python_coding_books_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75f0c143-12a0-4aaf-ae28-e586ba49ae75/zubirixevawijenad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b404be25-3371-4089-a443-777cf4a3f568/82660298479.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/145166862/tuwirojuve.pdfIn PDF document text
    • http://kevukimugo.pbworks.com/w/file/fetch/144602016/xatisigawefajuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44651112-976a-45ea-b57f-f7e535bcd626/xesopulowopepura.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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 5100 bytes
SHA-256: f62043b2a55abc3f901fe6dd6e6f07bfc80af6930bc1f612be05ff72e17061d8
font_01_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 9564 bytes
SHA-256: 90f4525fabf2c35e06a581287d54f43c54e3824b3d0c7e3fe5f0e3f99305fd7c
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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