Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4f9a3482471635…

MALICIOUS

PDF

90.8 KB Created: 2021-04-09 03:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02c97d8530abbe09a05c635c4b346da7 SHA-1: 98a45b316132fc9c83de2de9d538e23401d919c5 SHA-256: ef4f9a3482471635be90cdecaf09d0bc8564c636611258c7e961de04088b3315
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=smart+wristband+price PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/ihggipn/47681528071.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/J9jfcbX/lajogamikagulem.pdfIn PDF document text
    • http://prizinsta365.online/how_to_set_up_scansnap_s1500f90hs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480580/normal_5fe4ec9309417.pdfIn PDF document text
    • http://goodsun.space/ledaderivumegobwnq1m.pdfIn PDF document text
    • https://cdn.sqhk.co/tumozaraf/TFZqxT8/vlad_a4_fake_call_pranks.pdfIn PDF document text
    • http://creditscorehelp.info/dujixevurotikkk2so.pdfIn PDF document text
    • http://senteber.site/verorizirezejigaxoj08t0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5fe0fa46e845c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5fdafdbe3bbd2.pdfIn PDF document text
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/b446b849.pdfIn PDF document text
    • https://bivuremopukojez.weebly.com/uploads/1/3/0/7/130740249/divivawekunolusij.pdfIn PDF document text
    • http://moscow-siberian-force.online/ge_washer_timer_knob_assemblytkf53.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/zaxawetawupo/holiday_flannel_sheets_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3773bd91-e191-4d84-a5af-09f4101a437a/nosc_san_diego_commanding_officer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e7568ac-8d15-41af-b148-9912a3dd1c63/town_of_coupeville_municipal_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da41a6c2-db3c-4e2a-8fa6-fc25aba3df77/can_you_cook_boiled_eggs_in_an_instant_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5aab0c-0e7a-4cea-8511-fce4f4a9c001/14755291928.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/american_pie_presents_movies.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 5520 bytes
SHA-256: dedbf960e6d770d2ae3132c751666cf615c9e96e7fd341fcb00ec32388104549
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 4120 bytes
SHA-256: 111c1c339ebac73b1249a232c0fcbe5abe4e7ebdc3bb3f2e5e25d36b07447c92
font_02_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 11472 bytes
SHA-256: 5713bcdcc2a6da21db2e68b5ff23dc07577feaa14b50283cae02a2a040e8dafa
font_03_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 16168 bytes
SHA-256: 2732ee4e6fc52e1f0b465c06e50f5b132505da02cc6e93ae85b7d8375cfdad8f

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