Malicious PDF — malware analysis report

Static analysis result for SHA-256 67944f21af9539cf…

MALICIOUS

PDF

72.2 KB Created: 2021-06-09 07:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bda4a2013da7d7e69b468a0cc015b654 SHA-1: 85617a5bab6a54586d059d0458ec8472dae38c94 SHA-256: 67944f21af9539cf0510f03f5b700d11d6b264f6cdb3fd413163849690b5e75c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body text is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, which is sometimes used to create malicious PDFs. No scripts were extracted from this sample, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/pbw?utm_term=noun+activity+sheets PDF link annotation
    • https://sasozepawises.weebly.com/uploads/1/3/4/3/134315695/789037.pdfIn PDF document text
    • https://vigenawora.weebly.com/uploads/1/3/4/4/134495248/6457253.pdfIn PDF document text
    • https://fiviwadixuxenel.weebly.com/uploads/1/3/4/8/134854304/104252.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/mejozimuxob-gofugenulu-fozosuzasak-tuwewa.pdfIn PDF document text
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/5753586.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/66dc7315-1d5a-45fe-86ad-976d634ec1e1/91474213780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99834d97-ce4a-4bef-99b6-3022d38e2fff/accu-chek_nano_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0f7812-9bd8-404d-a6da-282b44dc586d/dikamekiwenixe.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/xenabesade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fb0eb3-a7b8-46bf-8593-0c6ef95518d6/fruit_smoothie_recipes_with_yogurt_and_almond_milk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fd696e-8558-48c3-ac4c-de637e54bba6/zubibujewavenafoxib.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144613959/how_to_unlock_schott_ceran_induction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15212a2f-108a-41ce-a3fe-73007166ed93/kiss_the_rainbow_reviews.pdfIn PDF document text
    • http://tevidaxen.pbworks.com/f/90103213845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890c77cc-6adb-47d5-81bb-1cb7a4d83eb1/loxivosizegasozovejope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11928820-cca8-413e-bfa5-13ce2c7aaecd/what_is_the_difference_between_a_biological_variable_and_a_psychological_variable_as_variables.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/viveputel.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/vollhardt_organic_chemistry_7th_edition_solutions.pdfIn PDF document text
    • http://kukuwowuxen.pbworks.com/w/file/fetch/144913575/pitbulls_for_sale_in_los_angeles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed55d87-2616-44dd-b496-17f04d559951/magnum_energy_inverter_fault_codes.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/26420626480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b0eaa3-7325-459a-a9dc-d02e868424a1/what_are_the_milestones_for_a_2_1_2_year_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4781ed60-d338-42fe-8ae1-198022a26933/what_is_triage_nurse_ordering.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_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 4892 bytes
SHA-256: e1e64110fcebba271754b5328371b7070673b67b0da2612585110156a347f87d
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 10288 bytes
SHA-256: d26e1dc21247eacc1e15ab9cbba73f4293ef2292d8f0d18638a327a920619666

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