Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ba3288716c572d…

MALICIOUS

PDF

77.7 KB Created: 2021-03-03 01:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 019a7ec1c988ce9c0863cf978276ede4 SHA-1: 72df3e960cd02a699b5e3dacdb948380cdded947 SHA-256: 03ba3288716c572d673cb16a381b38291dcc58c559781a10a74b31f601af5196
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with a critical heuristic firing for a "PDF_SEO_LINK_FARM" and a "PDF_SEO_UTM_REDIRECTOR_LINK" pointing to a suspicious URL. The ML classifier also flagged the PDF as malicious with high confidence. The primary malicious URL identified is likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://gimoguvi.ru/award?keyword=after+twenty+years+pdf+class+8 PDF link annotation
    • https://cdn.sqhk.co/woselukafo/ib8cgg2/u_mobile_postpaid_plan_iphone_12.pdfIn PDF document text
    • https://cdn.sqhk.co/xozawimepod/LNAJ7gi/global_war_simulation_africa_premium_apk_hile.pdfIn PDF document text
    • https://cdn.sqhk.co/pawexedibib/s8jdhdi/92731732888.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/hgswjWv/xuvuvirapidoroke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_6033721a1e8c2.pdfIn PDF document text
    • http://visiblawty.com/chrome_remote_desktop_windows_100wciz.pdfIn PDF document text
    • http://devgame.design/taxosuvawifigamaxirorijxorb.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/a19b4fe647eb938.pdfIn PDF document text
    • http://bigwin-1xbet.fun/archery_game_for_mobile4lgdy.pdfIn PDF document text
    • http://persequenteamsohbet.com/36682789409cmy31.pdfIn PDF document text
    • http://legrand-spb.ru/42876742128zrc94.pdfIn PDF document text
    • http://dektesheff.xyz/trig_function_calculator_sin_cos_tanmdxov.pdfIn PDF document text
    • http://detonic-romania.website/how_to_describe_your_writing_style8vuh9.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/SIje6ax/shell_club_lbi.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/wipotegadodorek/59845851615.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/archery_mod_apk_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/rosebava.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/kigofada.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/jaxanupifilulatuda.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 4

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_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 5524 bytes
SHA-256: 1670c50d3b4309a55fce47f0e6706b164426d4633e9865f3cbac5b5182287acc
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 11060 bytes
SHA-256: ede1a3c975b1d679fe1ea7abdbced2db0757e63bec182896f3ca918edd0b996e

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