Malicious PDF — malware analysis report

Static analysis result for SHA-256 109ec3d4caf4d80e…

MALICIOUS

PDF

78.4 KB Created: 2021-06-01 16:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a769f42d214f927bc60e3a78c079f782 SHA-1: 4d68bb2183f5e459726890eb6939585ef87cb65c SHA-256: 109ec3d4caf4d80e39a257035444db31cad3c6877788bfc76defe01ae0887c47
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, characteristic of a link farm. The primary external URL, https://catamma.ru/pbw?utm_term=pokemon+ultra+shiny+gold+sigma+evolution+guide, suggests a lure related to game guides, likely to redirect users to malicious content or generate ad revenue. No scripts were extracted, but the PDF structure itself facilitates the link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://catamma.ru/pbw?utm_term=pokemon+ultra+shiny+gold+sigma+evolution+guide PDF link annotation
    • https://retarabad.weebly.com/uploads/1/3/3/9/133997928/tewitegowufugur-lakozigajakogog-dalebezemono.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/renamesog-petum.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/jezipifegejapam.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/1bec13a3-bb4a-4afa-8fde-4f7d78f22b26/18749871900.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144431757/tamilrockers_full_movie_download_tamil_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d935c0-3210-4031-8e2f-934d238e2b80/calories_in_a_taco_bell_crunchwrap_supreme.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144420264/43299810178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c84f2b7-8c54-4479-8318-611f8c0b02b4/10273961874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71803887-34a0-46bf-9b04-51d376d71f6e/dijevirogabogamezuluboja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24777815-ea2a-4e90-9cf2-1c39a867b158/jasiteliver.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144428229/canon_lbp6000_lbp6018b_driver_download_windows_8.1_64_bit.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144413184/air_force_x_group_english_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38a7fc2-eeb9-4fc4-9953-a8e75006aeaa/amar_chitra_katha_stories_of_krishna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1588c7-6526-46c6-a99f-ab67c8ec6023/how_much_is_a_schwinn_airdyne_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89723066-d6c9-4a0b-b9db-ca22bf615b2e/does_subway_calories_include_bread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f22d12-efab-4b9b-b686-517d18827106/xozubibibifufefuxuk.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/rovilexuvitebitej.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144426024/94167419754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53448d50-4d70-47e8-8433-3d2620b11c85/motorola_dcx3400_manual.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/agatha_raisin_season_3_episode_3_full_cast.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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5464 bytes
SHA-256: d70a9d6d32541f2cef7e6701f9c7fd2091c45a7ec48563c8333ff64895dfc2e2
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 11860 bytes
SHA-256: 5e222df1dc264d6111b70dc38df69226297e91a8c4392f23ce45fa7a958e3bee
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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