Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b4de46a2341572…

MALICIOUS

PDF

79.8 KB Created: 2021-05-05 20:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9eb9407c8b54cd4a1fa5e38b88dd411a SHA-1: 6b7183e64e00d7e2a3c43191a87582663aee1f73 SHA-256: 23b4de46a234157247a73d94df37b0c11367f89992e946254b487f07b58c829f
146 Risk Score

Malware Insights

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

This PDF document contains multiple external URLs, with one specifically identified as a link farm on disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pattern, indicating the document's content is likely a lure to trick users into visiting malicious links or engaging with fraudulent services. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/strik?utm_term=what+is+class+b+airspace PDF link annotation
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/woxodig.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/jhfhhii/kufukotani.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/nipubudul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_604a8774b87dc.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • http://belplitka.ru/can_i_report_an_inactive_twitter_accountqaeja.pdfIn PDF document text
    • https://cdn.sqhk.co/zewapoxi/Pz9uhhG/joker_hd_wallpapers_for_mobile_phones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_60209b5c30838.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hcgcrih/bezadawukadex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390055/normal_5ff49d17575dc.pdfIn PDF document text
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/79551703bd60ef5.pdfIn PDF document text
    • http://chambre.xyz/18074029298r9b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_58e5696c6606416dbeb33865bdedd667.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_a7124d753f8b497ea805f3038a76530b.pdf?index=trueIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_19a70d03506449c5aabc5d3faf2ee653.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece9f399-e3a7-4b66-b6b0-3e3625fe33ab/17414221116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f548966d-5021-444c-b25a-4ba7d5ec1943/91571751129.pdfIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_7685802065ed40e8bc81c8f57bf66b87.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_2a91b2d6f9834a2f838e574738ebfa94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1ab573-a2d9-4ca2-a8c9-ff424fdcc151/what_is_the_best_alexa_to_get.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec6b5c8-1da4-4e42-b065-0a2c8478da8d/what_is_your_best_dog_breed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39393b73-89d0-4248-94c1-fd0da33edb60/mexican_whiteboy_chapter_15_summary.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 5176 bytes
SHA-256: 3e0a231047043ede28e1f41dfe13a7e191e7fea361dee41c98c51b064b2dbc8f
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 10808 bytes
SHA-256: c13829545de4dd8519422d07c89c859096fe988ea905c894d3829ae73ea2d370