Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d21efbb66edb6a…

MALICIOUS

PDF

69.4 KB Created: 2021-04-03 05:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c64e2c0499690f1bf8a5a6e7da9b160 SHA-1: 23103e090ea1767c9df53782c8c156d96c512771 SHA-256: 62d21efbb66edb6a6e67ea9a10139a5e68a4aaca89ff64fd7610aa1a8dd59623
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=north+campus+map+ub PDF link annotation
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/f48f7be373.pdfIn PDF document text
    • http://expressday.online/905780889015h5yw.pdfIn PDF document text
    • http://file-id.ru/490068117527bjhf.pdfIn PDF document text
    • https://simamofot.weebly.com/uploads/1/3/3/9/133997368/kedosubogaze.pdfIn PDF document text
    • https://dorakipep.weebly.com/uploads/1/3/4/7/134747047/7c97998f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5ffa4490e5561.pdfIn PDF document text
    • http://gbo.guru/studio_apartment_floor_plansrowah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416299/normal_600091e513acf.pdfIn PDF document text
    • http://onkoprofi.ru/its_kind_of_a_funny_story_book_age_ratingz4ue4.pdfIn PDF document text
    • http://italywow.pro/kenmore_dishwasher_installation2gdld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_6061f3670bb03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369915/normal_5ffd5bc9475b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366385/normal_60081712c7e63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e221411-76b3-4e99-a169-1c013a577fd3/advantages_and_disadvantages_of_mixed_economic_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060d43f0-0919-4c72-9f1f-54be215fe817/can_you_attach_a_car_seat_to_a_bob_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1c6537-364c-4c14-b266-33b6e9863899/nhc_thiu_nhi_c_vng_bi_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ca1b8b-c658-4b3e-981d-1827c5820bfe/74572985452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0fdfbd-9a62-4369-bb1e-d25d382d2518/17150743296.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 5252 bytes
SHA-256: ba0ebd71851367d23e6b159a9767f1fbe7a3aaaaffde52c3c70abb3d26ca7660
font_01_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 11508 bytes
SHA-256: 889058c23f2626b953bc67b385c0d13b3cf6bbe755d3e05e70e9e95f7dfadc8f

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