Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8bfb6f213abf4c…

MALICIOUS

PDF

203.4 KB Created: 2021-04-18 00:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2e25d6b5288c8f79b672ff02b88a4553 SHA-1: 282f26da5f24809923a56401dd1ec96a0bfab8a0 SHA-256: 6f8bfb6f213abf4c06531656f1e93f4db2a8bedb134ca5ce12821107daed4941
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI and a high-severity heuristic firing for an SEO redirector link, specifically pointing to 'https://jottigo.ru/strik?utm_term=the+miller%2527s+tale+pdf+middle+english'. This URL is likely used to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=the+miller%2527s+tale+pdf+middle+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fc5eeee3d44e.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/jahiYha/repost_youtube_video_to_instagram_story.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479439/normal_600725335ca12.pdfIn PDF document text
    • https://cdn.sqhk.co/samumosoxivi/ijbifEK/car_accident_last_night_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487382/normal_5fcd123c5436b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_605fa56270995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fe87bd21efee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_a4b0be58bc9c49319dd50d5571d03c71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/romantic_birthday_wishes_for_wife_free.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_0bbdbbf302e54ed4bd054f70ccce8f4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/031bee6e-77fd-4166-8f4b-2405eaaf660b/excel_for_dummies_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6021513-2c7b-42cc-be49-23e7cfb961eb/how_to_reset_mini_brake_pad_warning.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/94031822697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cc4c56-a0d0-492f-b9ad-6d2179c0f7eb/69941712808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88629589-1557-42d1-863f-a818f0500f25/eyelash_extensions_certification_training_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/how_many_cups_is_1_pound_sweet_potatoes.pdfIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_479f9b6b9cc549168ef0b3d0fdf89b5b.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_30f53559877c4190a3ac42862e41de0a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b95bde9-b2a3-479f-9ed0-6e8e2271ef21/bafikumanebuz.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/91388257624.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/36304749628.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C61D 5436 bytes
SHA-256: f96759a174081ff72da56481c5ab33afc3804e1bb3de2c2cac16fba583be7fc3
font_01_sfnt_off0002d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D874 16312 bytes
SHA-256: ddc5ef5a561c470544fbb069d70b0c25b30bd5bf2e9b963af0984f9e265cd310
font_02_sfnt_off00030a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A14 16208 bytes
SHA-256: 876bd3b4afc640ab4cff1f9bc392e93857408ed5a4921fc058d2120fca33b790