Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a751476d8dd692…

MALICIOUS

PDF

77.4 KB Created: 2021-03-12 00:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8fdad62419f76f5d6d8a076df4b832d1 SHA-1: b9aedeae575bb365425b15a6bd373d2aaef036aa SHA-256: 92a751476d8dd692bd0e8211cd673445f391909cc1758e1998a4c8c2caad472d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, https://jacksth.ru/award?keyword=business+proposal+template+free+pdf, suggests a lure related to business proposals. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate the document's purpose is to direct users to numerous external sites, potentially for SEO manipulation or to host malicious content. ClamAV detection further supports its malicious nature.

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://jacksth.ru/award?keyword=business+proposal+template+free+pdf PDF link annotation
    • https://punekoba.weebly.com/uploads/1/3/4/6/134612552/nifojozuliki.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/hfshhe2/ataraxia_definition_in_greek.pdfIn PDF document text
    • http://dutov.org/how_to_remember_resistor_color_codeybesx.pdfIn PDF document text
    • https://gubizelejipeter.weebly.com/uploads/1/3/4/1/134131403/juvemavanuri.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jehiWlc/fonexowazetivu.pdfIn PDF document text
    • https://cdn.sqhk.co/tatolodam/5GijYgO/golofasuzav.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/QVm9hcR/cross_stitch_fabric_store.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/zLijOgi/sculpture_center_new_director.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/g7hhXOV/racing_fever_moto_hack_mod_apk_android_1.pdfIn PDF document text
    • http://nicechange.space/brother_mfc_8710dw_not_receiving_faxesbs9qq.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/makirupinoluvaxeli.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/j7llxjh/burebefugega.pdfIn PDF document text
    • https://cdn.sqhk.co/zovigobut/QMhf6hc/meme_wallpaper_hd_1920x1080_anime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokudapele/progressive_era_reforms_chart_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/tukevavi.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/28037862286.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/ralunilulutus.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_474b5bd1664c45e5b2384b66dab0f1c5.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_f90b9a6b9baf4f559ff9604d4592487e.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_f4833a6be6a44ac29a82d45ea5ba7645.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fexuror/46306760892.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_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 5236 bytes
SHA-256: 94dc841b93928db99f276373424b4b5b150b9f633d4f11d0bbb9d0a0ee32e0d2
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 9724 bytes
SHA-256: c8f9c5c8209fc89921e6ba3ef248297053d391a670e1151259d74ab92298e67c