Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8474a1f33112867…

MALICIOUS

PDF

78.8 KB Created: 2021-04-22 15:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51a3fad6e0adff0d0c0596ca2d4ebfe7 SHA-1: c4c7cb2c557114230506cef9453559f9d331f4d5 SHA-256: c8474a1f3311286742d59a25a1d92b5c2505da799fd28f483860f21b077f3403
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to sentence diagramming, directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=how+to+diagram+compound+complex+sentences PDF link annotation
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/xufolo.pdfIn PDF document text
    • http://hurricane1.space/rheem_tankless_hot_water_heater_servicezasml.pdfIn PDF document text
    • https://rusunesezov.weebly.com/uploads/1/3/4/3/134309606/7438430.pdfIn PDF document text
    • https://xuremesedadewo.weebly.com/uploads/1/3/4/5/134500919/gakudixotavujuxag.pdfIn PDF document text
    • http://rentline.pro/cars_movie_songs_mp3_downloadkqvkz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_604037265f1ae.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/6897414.pdfIn PDF document text
    • http://paksorond.xyz/xevogadazagrwn9q.pdfIn PDF document text
    • https://popovomogomube.weebly.com/uploads/1/3/0/7/130738885/meronubuzunadi.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/farafezozo.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/getuziwurevuzevoxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470409/normal_606e70957dd05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5ff3a175d6e77.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/8864011.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/crown_manual_pallet_jack_parts_diagramgejhw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_602649bc4cddd.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/mexebuxakaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fedf7a4f1006.pdfIn PDF document text
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/61e4a8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/35825bb2-2b1a-4eba-ae15-1b032df1a6f5/39590539909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e123e5d-da2a-4aac-8444-943785a71aad/frantz_fanon_black_skin_white_masks_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b707b6-ea29-4886-8d72-b84bde671eae/how_to_get_free_songs_on_rock_band_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7f8afd-a386-4859-b395-70567fd73c44/fasedivovitaradejixuga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 5396 bytes
SHA-256: cb11a6c5a5ed3c6d0c08815fb323631160aeee2c477c6baa8da929c72575d142
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 10264 bytes
SHA-256: 2ddaf683ab558449cc5b964591fdfd1d4850926f2c0e6886cb4f81dd994fbed6
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361