Malicious PDF — malware analysis report

Static analysis result for SHA-256 155521de18ae0866…

MALICIOUS

PDF

81.9 KB Created: 2021-03-13 21:04:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 241133517d37c9a07fdf38b25cb3ecc0 SHA-1: 912bcbe5971aa48bf3f6d475a1a7ab07b58fecc6 SHA-256: 155521de18ae08660ab3266b6536a6e141378848bcbfaaf4585e19c57692b908
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/123?utm_term=fixed+asset+register+templates PDF link annotation
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/694bb2b6857c4fc.pdfIn PDF document text
    • https://runakimuwutisi.weebly.com/uploads/1/3/1/0/131071038/1a97b195a3d4.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/dakotagumivax.pdfIn PDF document text
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/pibevufabotakafudi.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/zogajuturunebut-xegirugoposobup-zuruzolor-kurimadibisekis.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/how_to_get_a_private_investigator_license_in_georgia.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://s3.amazonaws.com/bodajaku/9635739139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/641c0adf-4e44-4c60-99d5-779f85cf439b/wizixefofuv.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/bombay_velvet_all_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/504db123-ac5f-4467-87cd-4993c3d2d587/how_to_download_ghost_of_tsushima_samurai_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9787ba-c0e9-467d-b6e7-314fdaa872ce/sub_zero_refrigerator_dimensions_width.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/jugibu.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/what_is_the_purpose_of_an_estoppel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5322bcee-e94e-4365-9c3b-39f3e3646339/christmas_crossword_puzzle_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/36434065705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a82226-ba01-4d24-a10d-5bd23095b340/le_petit_nicolas_book_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5c260c-375b-46af-acc9-813934909136/53165676096.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/moto_g6_phone_case.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/jupagivuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b788578-941b-4cc3-b1ee-9638b4aa23ba/all_my_sons_moving_raleigh_north_carolina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5ab06c-da61-402f-82a7-0eb9e6821724/29137492538.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_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 4872 bytes
SHA-256: fc22dd9b4cd431a7450b8ddd7019cd04482c31df2fbef58593834d61ac9a71b0
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 10956 bytes
SHA-256: 5f0a2de9f99c7d2e462a8703844716edf58d650c1d51004d25b6f55cae4ebf04
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c