Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab4ced0db5bd01a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 00:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: aa0ebb641b69438c264c28b8dd4bd8e8 SHA-1: b01cd468cea073aeba93456d25355d4d3451f830 SHA-256: 5ab4ced0db5bd01ace2d5a861f367b36f77e174e8e6ec841d0d5c9dd7090c5d8
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it functions as a phishing lure. The embedded URL, https://jacksth.ru/123?utm_term=barbados+passport+application+form+a, is presented as a download link for a passport application form, which is a common social engineering tactic. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/123?utm_term=barbados+passport+application+form+a PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500438/normal_602bebe6847c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467298/normal_5ff3690d0171b.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/2pAMoAO/color_splash_app_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/5mhjhbo/xugaxovun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491673/normal_602cf5026f912.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/fJqiiWF/lemufedanop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5ff0e3ce7b0a5.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/Nicjbja/wibiloluji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ff7e9b9d21fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_6026dd75003f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/64607960636.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/cid_new_full_episode_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e24f6f-cd43-4290-b8f3-fa368c2e56a9/taco_bell_chipotle_chicken_burrito_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e091e4a6-f505-44ee-a0bd-45f76b41516c/kenmore_elite_french_door_refrigerator_making_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/17982321802.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/log_scale_graph_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4481e1de-8270-4e64-9456-3fa5ca3dc314/tender_spot_on_leg_no_bruise.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/zogutadimu.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/blob_using_javascript.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9739f9eb-0f1d-459b-8538-65c8cab4e9aa/xiwumisiwumiragitepomuwum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0060ba3f-f436-460c-ac53-c77f538339f1/how_to_read_the_bible_in_chronological_order.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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 5492 bytes
SHA-256: 5eb0ed837ed7324ecf980c922df53f717f17e73961c82e4f843eb3607cf861e8
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 10940 bytes
SHA-256: f5e903a3acf10fca8c1e370c0f65e1ef3391e150dd64a31513acfd382fbd73c7

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