Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57581cc9749b9d3…

MALICIOUS

PDF

77.0 KB Created: 2020-11-13 07:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2be72ecc01757ba14aeb4ee42732e7ec SHA-1: 687d1ecedf37b2cae7256556cb22342944ca33de SHA-256: f57581cc9749b9d3cd31f9d049c4b4380f63bfd8c1abf08253c1acc33320490f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is a PDF containing a mass external link farm. One of the embedded URLs, 'https://trafffe.ru/123?utm_term=shotgun+muzzle+brake+choke', is flagged as unknown reputation and is likely the primary malicious destination. No scripts were extracted, but the PDF structure and heuristics suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffe.ru/123?utm_term=shotgun+muzzle+brake+choke PDF link annotation
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/naxebonodas_dimutuv_sapodosaponalal.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/dorulusof/anger_management_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/blender_2._5_free_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da68e563-6272-4c86-a1d6-2faffbcccf0e/rexed.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/bartleby_the_scrivener_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/harry_potter_book_pages_clip_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5bbe47-5314-4019-bc36-4d3178a8609b/ucm_gravity_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151e78b0-63c1-4eb8-8dc6-b603344ae18a/download_pokemon_mega_emerald_x_and_y_gba_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/basic_computation_principles_of_computer_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/79997962645.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/william_cronon_changes_in_the_land.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/nogepeni.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/getting_to_yes_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/tusujuw.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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5392 bytes
SHA-256: 35291d891a3b4f4d827db47e2cd6f31807fba98120f44044664fba887d0ec788
font_01_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 10500 bytes
SHA-256: 8cbc870292b3a362dbeee32320f7df7c5b9d21671b3c3f07a8e17abcf7788e17
font_02_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 19840 bytes
SHA-256: d98dccf4be439ea4ca727bc0788f29fc5ddeb4ce16b76083412bf8405f601e62

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