Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42491979af84548…

MALICIOUS

PDF

75.3 KB Created: 2021-03-12 20:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b29c9726a1d38feb12eb4793e58fb669 SHA-1: d1325d5f67381e1abaf0e67b3cedf814c4272539 SHA-256: e42491979af845487976e4b04633473462e046cded0609bfdde2ecd899fa54af
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, many of which are part of an SEO link farm designed to redirect users to malicious websites, such as the one hosted at kuzutuzo.ru. The document body, though heavily obfuscated, contains references to search queries, suggesting a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/aws?utm_term=how+many+carbs+in+boston+market+creamed+spinach PDF link annotation
    • https://cdn.sqhk.co/jegamaxegev/Cieahh3/stress_balls_gummies_for_anxiety.pdfIn PDF document text
    • https://cdn.sqhk.co/wamitavixitu/6jgrltt/animal_crossing_like_games_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/tjb7OUP/comic_template_photoshop.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/pejezisosag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fccce3263951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_60410f2978daf.pdfIn PDF document text
    • https://buvijolijesikuv.weebly.com/uploads/1/3/4/6/134602818/kadajub_ruzubewefefi_jegugififonile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6022232da9282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_602914b92198e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_60264f6b9b559.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fdf7fb90caa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_604ac6aa256f9.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/1848815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/febe0040-86eb-4f2c-8339-7d13bd464138/diary_of_a_wimpy_kid_dog_days_cast_manny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5291176b-f765-4df6-8085-3e8411200ec4/pitasav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6217f224-5dac-4583-ae4e-5f6d5cd731b3/power_book_1_ghost_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866f5c29-1d73-4e59-8064-2e1db433c521/nurarolagisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542c7961-6fa5-45e3-86b2-36a64325e6c9/bepinomeximebebilagofij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ddabda-4c6b-4860-aaa3-6f118446d287/40084860384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d41acc-63e7-4a46-adda-a0a6bf26d3f6/94673583276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f5763a-b460-4b5e-b92a-934967f46edc/muxil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0c0ca8-d165-4a3e-90b8-373eee88072a/triggers_in_pl_sql_tutorial_point.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 5428 bytes
SHA-256: 8200423a7eb9a8fb2c8a91518b45fc667bb877ff66bb2f241671f08329763857
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 10828 bytes
SHA-256: ffcef2d2653bc8be2b72c58cc5169878ba328f8b0873e719fe8e6967887eced6
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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