Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb19b877138ce85…

MALICIOUS

PDF

97.3 KB Created: 2021-02-28 04:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8cb7e8794dd0b1cacfa1c2c1c1dfda9b SHA-1: d24ea125e1691d040ab7b36260955406c7636536 SHA-256: 8bb19b877138ce853d5afe35d9b98be92ed3f477b4a928048517f1cedf68ebea
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=the+aim+of+acceptance+and+commitment+therapy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470703/normal_5fe6b33ed0262.pdfIn PDF document text
    • http://wide-do.top/nolobitevaxuthekg.pdfIn PDF document text
    • http://padujosa.22web.org/marriage_anniversary_punjabi_song.pdfIn PDF document text
    • http://eurozone.pro/69143619920u1ygc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370533/normal_5fe184dab22c5.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/hjhhhhm/ticket_to_ride_song_original.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_6029fc12cf111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407331/normal_5ff47ea001150.pdfIn PDF document text
    • http://babbieshop.ru/35565376091u8zz8.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jgqyKja/the_legacy_cabernet_sauvignon_2014.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/bp0hg6I/football_trading_cards_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_601fac6e2b40f.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/j7ghK2e/volume_booster_sound_equalizer_apk_download.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
    • http://bugibek.rf.gd/arduino_uno_pin_details.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/90682386011.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_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 5024 bytes
SHA-256: 51f9516936fb9c10d9f53e083027001ea3af5034710dc1b2b330f5a40fdf3910
font_01_sfnt_off0001447d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447D 10960 bytes
SHA-256: 589f79d2f27487cedea19ea3b82d612d3f8a6fc7db8cf6a1775f5242b28407e1
font_02_sfnt_off000169e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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