Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd27d1f3f41fcc1…

MALICIOUS

PDF

74.2 KB Created: 2021-06-15 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c46d25558459f2bdd4ff21ac85e5a4b3 SHA-1: f08c28974d400c04e142feb06676ea5b04abbb95 SHA-256: 0bd27d1f3f41fcc1b8129e75742b68754fc1f62aadeb07eb5bcac6c7f7c2848a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/pbw?utm_term=sickle+cell+anemia+gene+chromosome PDF link annotation
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/401178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_6006e1cebe553.pdfIn PDF document text
    • https://misurabize.weebly.com/uploads/1/3/4/6/134666879/xavijoxu.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/tedodelokazoluzodak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_604934da9f385.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/416e9302-946c-400e-b48e-72bd5a50e21c/jopugibenazepar.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426318/how_to_write_a_news_report_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21e66eb-cb03-4843-9164-e592e2e15231/best_game_theory_textbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81acc5f8-c1f1-487e-8fbd-f7c2eecc0fbc/how_much_does_a_commercial_coffee_maker_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b633f6-3687-46e1-be40-9948ecbc7c04/gokuwosujawinub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b026b9a0-840f-4b7f-a774-994e91a49aec/nunagojawofarozogewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3ca2d2-82ef-4df7-994f-d240c30e1b30/vuleviwi.pdfIn PDF document text
    • http://tedadopite.pbworks.com/f/install_windows_with_rufus.pdfIn PDF document text
    • http://tukosifana.pbworks.com/w/file/fetch/144827109/kojijuzafipapefujoxo.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/nasty_things_game_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca2a4be-2ee3-482c-800f-e24a84ff9514/new_catholic_encyclopedia_1967_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4343457-1d3f-494b-8957-4bebae46e1cb/13176526596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c7188bd-bced-4a4b-9217-8529a2b861d5/56808080196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94812bd0-2aaf-4a49-8a11-e58d2e7c25b3/who_is_the_main_male_dancer_in_white_christmas.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/brush_pen_hand_lettering_worksheets.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_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 5380 bytes
SHA-256: c34f290d2bd18768cb5ebf7f3910bee9656d24f3194a160cb445c4164ec94296
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 11128 bytes
SHA-256: 42b20ae81271702668aa4d301a3194915f5af1bad0b4d399e9540f34aeabe80e