Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64a199e95e1068b…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 02:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d17650b78b90b4a5048804778627cc88 SHA-1: e54b7f0e14ee9cb9588ea84be6f6fa42a113c333 SHA-256: f64a199e95e1068bc8a63aef720f454d50e5712aa6348fdf926a53b221cb9b9c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise and suggest the document's purpose is to drive traffic to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/wix?keyword=special+right+triangle+trig+worksheet
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/sujuno.pdf
    • https://cdn.sqhk.co/kelopifagisu/hhnWjaM/31985455092.pdf
    • http://reduslimitaly.website/goluxiguvudozokaxodofigil3sy2b.pdf
    • https://farumurul.weebly.com/uploads/1/3/5/3/135326432/1965066.pdf
    • https://cdn.sqhk.co/jogekiluse/ghUjehe/nuposoramalen.pdf
    • http://datingsexchat.site/hobart_mixer_repair_fort_worthjx8kv.pdf
    • https://cdn.sqhk.co/dowusutitozi/hdhcjdM/happier_piano_sheet_music.pdf
    • http://navaram.online/turejulavemimosorisipifik7gr7.pdf
    • https://cdn.sqhk.co/kelifevaz/gGm3Xji/infinite_flight_free_air_traffic_control.pdf
    • http://freds.space/amar_chitra_katha_books_downloadymmxd.pdf
    • https://cdn.sqhk.co/bezorufuv/jWihjhc/year_3_maths_homework_sheets.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/zefifi_fivuje_pasujorun.pdf
    • https://cdn.sqhk.co/sezunofubuzi/ggEifzw/prince_runner_game_download.pdf
    • https://cdn.sqhk.co/zinoliwomi/d8gigh9/97607106470.pdf
    • http://pedagodogiko.getenjoyment.net/quadra_fire_santa_fe_pellet_stove_troubleshooting.pdf
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/09389.pdf
    • http://alcozerox.com/model_respectful_dalam_kaunseling8dj0t.pdf
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/84c11ab3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_387df02ec30d41f6b18ee95e530a3238.pdf?index=true
    • http://bifiwapaz.onlinewebshop.net/suwani.pdf
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_8bdcb12af1f349bf9683b0eb307ba6d2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40e.bin
4babfd8d80d47c4c2d2fa7224881c76f18b74a8ccf450092c3a26631cd6d4ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 5456 bytes
font_01_sfnt_off000106a7.bin
d0ecd161ce2df0cf8a0313b18a63fe8422ae639c55b81cd67b295982e36ee1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11540 bytes

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