Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ef703ea13a5c31…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8ef3e73dee11828a2066b13bb0472981 SHA-1: 4881b1fdd82f1d2a8f92b0c591700b48715be9a9 SHA-256: 56ef703ea13a5c314132a6fe992b25da43865899fad9a22a401b9d5a35eb6fe9
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 0.9998

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://golowaki.ru/strik?utm_term=washington+redskins+schedule+and+scores PDF link annotation
    • http://xegazinijitup.mywebcommunity.org/7752515109.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/f9eae40cdb3d6.pdfIn PDF document text
    • https://sipexagugiresu.weebly.com/uploads/1/3/4/6/134607427/masak_vabibuxes_xositati_putedales.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/UhgjdZU/zejeve.pdfIn PDF document text
    • http://mexicotop.xyz/vixuke5b9m.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/haA6Pss/enjoy_learning_constellation_puzzles.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/gjbggOJ/58251511554.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/Qjejjrh/47107613547.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/VhiDRv7/arena_football_tryouts_2020_florida.pdfIn PDF document text
    • http://dwatches.site/96067487473kriuo.pdfIn PDF document text
    • http://ouily.xyz/cnet_logo_freen3mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/jgyqhiS/the_island_castaway_lost_world_walkthrough_chapter_4.pdfIn PDF document text
    • http://pubggaming.online/baaghi_2_movie_2018_video0xka1.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/xigedawi.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/a0876f3b9072e.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/asciidoctor_table_of_contents.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/RAjajep/addons_for_minecraft_ipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_01ec74af2f6a4d2f94dda21c3c59d82f.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_ac800a7cab8748fb9a292b61d6e5ea2f.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_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 5276 bytes
SHA-256: 172cbc1e35930ae1a0eaa93c790d6c994b836fefcd3da95b1c8d5f099dcf7f8a
font_01_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 10908 bytes
SHA-256: fc0c62bfbf98a30e67c1a2db50c96193a59eb363c58d21c995682a1c122b9a9c

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