Malicious PDF — malware analysis report

Static analysis result for SHA-256 551ae9f1e53cac0d…

MALICIOUS

PDF

71.5 KB Created: 2020-12-21 00:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a6289c5869512987cef7baa96c59fbc1 SHA-1: 6889024e01e3bbb41f972209ae2f4ef96b32e290 SHA-256: 551ae9f1e53cac0d294c11a873fbede0e9b662dd09c151a2874a6c8303ed6f9c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external resources, including a known malicious redirector. The heuristic firings indicate that this PDF is designed as a link farm, likely to distribute malicious content or phish for information. The embedded URLs and the overall structure suggest an attempt to disguise malicious activity under the guise of providing useful documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=black+and+decker+20v+trimmer+manual In PDF document text
    • https://wudivaju.weebly.com/uploads/1/3/4/7/134762352/sikutakeni-powidijamisu-tepikibebodof.pdfIn PDF document text
    • https://tezugigawezen.weebly.com/uploads/1/3/4/8/134878192/gufonenob_furofitagafepuv_lotanomo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a0e875-19a1-4a74-893a-fef3fdf84672/week_5_challenges.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/69810755124.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/background_music_for_tutorial_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/49568412545.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/du._ac._in_datesheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/kindergarten_common_core_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/chemex_brew_guide_intelligentsia.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/fazojabuguxozanizerob.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/ave_maria_gounod_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/61137636848.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/fanozevonilusejudemifi.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/40241211750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d10ec49-11f3-49ad-9148-2ff8dc36723f/47314678060.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5356 bytes
SHA-256: 316fe72cc7bba7819e8f1ec7fbfc7d1abd154fbfc70d9e6b025022315b842939
font_01_sfnt_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 10724 bytes
SHA-256: 9cb90b5097b391c2439b042eddb0834ed84ef06379aeab558d73f6368679ea50

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