Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74b245b6ec5de50…

MALICIOUS

PDF

82.3 KB Created: 2021-03-30 13:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f8d321168ce0c5c5736e0cc57ed65576 SHA-1: 54c19717df3b914e74d345833876f03c48b0bb7f SHA-256: f74b245b6ec5de5007f0660f59fcb9e839c83108c61d73eb095b472948245e2e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/aws?utm_term=delonghi+portable+air+conditioner+flashing+hl PDF link annotation
    • https://cdn.sqhk.co/gonolesuzam/jajedie/pakadovumama.pdfIn PDF document text
    • https://cdn.sqhk.co/selodiro/cFivWwD/poxavolakugu.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/ghgflQY/free_cross_stitch_rose_patterns_to_print.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/hdigHmu/16233675208.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/dawelopozi_sofibidarikut_vutizasiduka.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/9270503.pdfIn PDF document text
    • https://nemegadixutore.weebly.com/uploads/1/3/4/6/134689972/wivix_xovivo_vitos_tedixagixugufo.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/whcbECr/15089125065.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/saruzeru_vurorojon_tikififelizuzan.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/iWehgh4/3642725687.pdfIn PDF document text
    • https://cdn.sqhk.co/magatile/ahdjhyp/pupilpath_app_by_illuminati_mobile_app.pdfIn PDF document text
    • https://wumuretulax.weebly.com/uploads/1/3/4/2/134235352/3701d837db.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/2452d8ca-ef76-4cf1-b08e-cd925695221a/66238882443.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_a7685867f77841809b7c768967d588a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/how_do_i_pair_my_ihip_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/what_is_the_meaning_of_rehabilitation_centre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a709f3cf-e39e-41e5-8b76-511dd4133028/how_to_play_cowboys_and_angels_on_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e8e484-50d3-4586-b655-b531ea15e6c5/can_cricut_expression_2_cut_vinyl.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_ed6048559d054212bb0e7cfabcef96be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sevoga/5128124505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab863fd-0ba9-49d4-a9eb-3ab266c8ce99/fe_civil_practice_exam_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0d261d-95b6-46de-bc1a-9e568230ac2b/jiwotavikatutujenanuris.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/how_many_heart_pieces_links_awakening.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_fbbee4ba84b441749201e6e3919d852e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 5556 bytes
SHA-256: c216016d79def8c472430e5502f043ed5fb7a10514f41ec1f0533605600f20a5
font_01_sfnt_off0001141e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 11604 bytes
SHA-256: af9fa421b69b5ce30f99e92dd7b0840e2ed6f142e5c83b7e14671b8660e423d2