Malicious PDF — malware analysis report

Static analysis result for SHA-256 944f2ac2940ac07c…

MALICIOUS

PDF

76.2 KB Created: 2021-04-19 13:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f23ccdce0eb9168ec43829d082a868ee SHA-1: 2bd2cd2538ec0e7f59ac7fd12b45d1827b7f62f6 SHA-256: 944f2ac2940ac07c5b8bbe0e78b824e9476c0d48439dec529c5feba5c65a864b
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be a search result for a 'Farberware 4 slice toaster oven manual', which redirects to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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://midufefew.ru/strik?utm_term=farberware+4+slice+toaster+oven+manual PDF link annotation
    • https://cdn.sqhk.co/buzulexoxuve/iiCiiaJ/ivry_sur_seine_adoma.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/jjigBgc/70634954562.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/ZiiJ5Np/drop_dead_gorgeous_death_scene.pdfIn PDF document text
    • http://topsale.pro/celebration_chocolates_nutritional_informationjjg6c.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/Mjc6SzQ/tanglefree_panel_blind_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/bovgilJ/72607213312.pdfIn PDF document text
    • http://subbellassecret.com/what_was_the_original_function_of_ancient_sculpturesi4e09.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/wujafivabipo/how_to_voice_type_on_google_docs_on_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/someone_like_you_adele.pdfIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_ba715af7d7f24bf8b3e8a4c4d07c0279.pdf?index=trueIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_4ec9a80ef8944f7d986daee6577b05bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec9b4b1-4e6b-44d2-a6b6-a806e1f401b1/jusedivubomaxafir.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_71b812d19045468dbf42fc76e6f3e033.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/vefesokibufusubadam.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_545b47e3388542ee9edff207635884fc.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_46be4eef4caa4055b2288a907c8cdff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/jumbled_up_words_worksheets.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_10077d05d0524afc9c37c400f91f887b.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_e874112e3cf44dd3ad7491d24be75d50.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_0a1222a5837b4c1a8df45abfb021cd08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10df4389-e535-42c5-b5d9-9a0b18f6c1c3/fulag.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_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5280 bytes
SHA-256: c65fe02db185ede7e1dfb05cbe77de983bdab67f93cca6894febec2f87156c99
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 10800 bytes
SHA-256: 5dfdb7b268aaf0e821bc87f78f972f4886f91c142091b0a6e7ec64f1438c1c12