Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cbb22cd22f97f8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 23:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4cc13774a6ddd8deba5780d5bd905a7c SHA-1: 50a052aa9861c2ec0130b8193f3e1c753eaeb955 SHA-256: 91cbb22cd22f97f8fa5afcf068b0ae93214838ace07f3351481d49d91aaf5ff2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://seumenha.ru/award?keyword=customary+units+conversion+chart+pdf PDF link annotation
    • https://cdn.sqhk.co/kokowoxiwi/iibhbdn/matching_letter_sounds_with_pictures_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5ffcc9fa15607.pdfIn PDF document text
    • http://sesalon.xyz/15123546399som3o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5fee3f7313b23.pdfIn PDF document text
    • http://finansi-7.online/alaska_airlines_ticket_informationcpqmt.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/hghjOJR/dumopatedebegemuloxezafes.pdfIn PDF document text
    • http://mebelrostov.ru/the_three_stigmata_of_palmer_eldritch_charactersam4i0.pdfIn PDF document text
    • https://pizudakuputip.weebly.com/uploads/1/3/5/3/135347645/8ba9c.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/ebsgcmX/kulun.pdfIn PDF document text
    • https://cdn.sqhk.co/ninulekuto/YLichhe/bixowogudumifajonalas.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/Lugf6jf/funny_sms_sound_ringtone_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/Y1hdjhD/bread_run_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/dhhiaid/pobikoleka.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/b28c2013d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_600b3ce22710a.pdfIn PDF document text
    • https://regivuno.weebly.com/uploads/1/3/1/0/131070843/7e9d8.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/jbjdYyG/space_drawing_hd_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_5ffb34f6bb171.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/49ce9184-112c-4a5d-9e37-ad47fcd58708/46213293506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68b4094-59bf-4a66-b83b-02ce9bba276f/paul_richer_artistic_anatomy_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1083c782-d2c9-42f6-8d05-f265a515fd0c/williams_sonoma_bread_maker_pizza_dough_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3065da23-013b-4307-859e-b8a7185f0d48/44263178679.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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 5432 bytes
SHA-256: b4166154cb6b2322b878666d794cd8850b2e43a8323240d29ac923b29af4a1ce
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 10724 bytes
SHA-256: ace2015aa6d19f1537f80b7bb99c22ea25bf04703bb178e9e47b19f136677a5b

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