Malicious PDF — malware analysis report

Static analysis result for SHA-256 5945857382408757…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 21:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 10e129e27a57f45ecb92ca9a1fdf84fd SHA-1: e7c724160df890986ca5c014b7797af58389bb9f SHA-256: 5945857382408757714168d53683a7dda42892ade52d168d3d2d115a4fc48adc
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to nutritional information, likely to trick users into clicking malicious links.

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://dafemum.ru/123?utm_term=chicken+kebab+meat+nutritional+information PDF link annotation
    • http://zuvatewovu.scienceontheweb.net/kindergarten_math_worksheets_free_printable.pdfIn PDF document text
    • http://bupetud.xyz/16283308736l4gbs.pdfIn PDF document text
    • http://ygrash.website/251974405342z1v7.pdfIn PDF document text
    • http://itprod.space/527097203085s7mp.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/midgfuM/synthesia_songs_midi.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/19051663408.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/jqxibhg/41913033941.pdfIn PDF document text
    • http://poverkavoda.website/94939881739fkep5.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/xIMviaB/65460190826.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/hghduhh/17890339536.pdfIn PDF document text
    • https://cdn.sqhk.co/xevuvuxene/Phejihd/acca_p4_lectures_free.pdfIn PDF document text
    • http://markettop.pro/4881423977267xfu.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/719dc688-d80b-4631-823e-c1418d1f3d25/damerap.pdfIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_2ede77df6e024cb3a52dc739327e59ae.pdf?index=trueIn PDF document text
    • http://kugajevekafino.myartsonline.com/wodinafujelup.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_47bdec6dcec041ac8ee1a53f880092ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16da417-458b-4560-8efb-80d1cfb1a8e1/very_short_summary_of_the_taming_ofthe_shrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c5a89a-96e5-4946-a602-34ed4564dd41/how_much_does_it_cost_to_build_a_mile_of_road.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_307d3514b6f54d508982e33dc78e7a01.pdf?index=trueIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_0f04cab4a4514b918ffdedc574686fad.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_1e26be9571e848f09b6e95f90d5bb399.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_7e2860ebd9104e5fad4490afb2c37f7c.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_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5052 bytes
SHA-256: 5cb93ff1bb5c0002ac0d689a43d7d60fc735adf2f18ef38f84a68713d7a4ca06
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 10860 bytes
SHA-256: c0de922e08ad99c2405f3a72cc07e3fb7bded38d05fdb298d74ef7335485c7eb