Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f86235fb5f87778…

MALICIOUS

PDF

81.5 KB Created: 2021-03-19 00:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 927b88c8f800a3327698c56c39c38dc4 SHA-1: e40f84b7673f6a4c27dc0afc606da72610b633ef SHA-256: 3f86235fb5f877789bdd2d3d9f90b0a039b501adef43f90f5c6d035363330549
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://jumiwimov.ru/award?keyword=american+english+file+second+edition+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460450/normal_602d4b32edd24.pdfIn PDF document text
    • http://kellys.space/ping_pong_ball_free_3d_model53opz.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/ihe6efZ/80s_music_playlist_rock.pdfIn PDF document text
    • http://relax35.ru/how_to_do_technical_writing5cbng.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/how_to_make_money_cfd_trading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_5fdb586cdb87f.pdfIn PDF document text
    • http://cabinetsly.xyz/5343164849389zi4.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/bjcNhjm/draw._io_github_wiki.pdfIn PDF document text
    • http://hesap-al-sat.com/16685133587lifuj.pdfIn PDF document text
    • http://lipenav.mypressonline.com/kibajumezajimigefifigizow.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/h7zjejf/download_bird_papa_bubble_crush.pdfIn PDF document text
    • http://latuha.com/ganukenezena2he.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369765/normal_5fc67520bcaf2.pdfIn PDF document text
    • http://lovelid.xyz/sokabcqlyb.pdfIn PDF document text
    • http://coupons2020.info/microsoft_word_download_fonts4yvlj.pdfIn PDF document text
    • http://rerubin.space/gomatilibigapuxobo5y3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_602ed27037acc.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/9Yaigi0/70442842550.pdfIn PDF document text
    • http://flathead.us/5230886417739qbg.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/fajixe/cartoon_couple_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/avp_2_full_movie.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/atlas_auriculoterapia_gratis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 5556 bytes
SHA-256: 4fc867bc1e2d9e8cc39e43264f1fe7b6d666b6f428a001f20d46d4cfb532b34b
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 15232 bytes
SHA-256: f5399d99de8f21dbf2f1e6560d84a11d3a1ccea2e40aa743bbe01e66276fe3f2

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