Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12fb6222896f31a…

MALICIOUS

PDF

105.3 KB Created: 2021-06-11 17:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab34d7ff8d23b24ca37950a004aa5634 SHA-1: a7ed340dc874293c7d19ff96998f236237979939 SHA-256: a12fb6222896f31aa0333e8a1b92c8232813040eabc76f9d8a0203d6ee0f9e72
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 SEO manipulation scheme. The presence of these links and the overall structure strongly indicate an attempt to distribute or redirect to other malicious content, rather than providing legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/pbw?utm_term=ganapati+atharvashirsha+upanishad+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5feb1564ec77d.pdfIn PDF document text
    • https://dukifuti.weebly.com/uploads/1/3/1/4/131437117/a8d2062ed00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_6025f930df47e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_600f259f978e4.pdfIn PDF document text
    • https://ziwolowuwuxux.weebly.com/uploads/1/3/5/3/135321756/2783278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_6053e1b648670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_60bc3b6c78262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_6057e5105c8fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5fc725e0c4cc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fe2312b5c991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://dagomiwavi.pbworks.com/w/file/fetch/145049454/bovezi.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/76138275300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ab9aa1-74ff-4562-86b5-86a883b3548e/12054281441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9740e9ba-81fe-400e-ac21-b693bef576a2/vovat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010057f4-f4a7-43a3-a41a-c7dcf75f9dde/ribogug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c96193-ec98-4716-99fa-886481eff616/how_to_have_more_blood_during_menstruation.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/managing_oneself_free_ebook_download.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144617277/bavozodurawukevokotixuraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a02ffe8-8fc1-4657-87ac-668ef0dd5477/little_house_on_the_prairie_season_9_episode_10.pdfIn PDF document text
    • http://runuwitol.pbworks.com/w/file/fetch/144886413/business_english_expressions.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 5188 bytes
SHA-256: d9eb5e854bc87d42d704eb81faa182a09ffa8c7ab4a2fd593c1090af5a351fcd
font_01_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 3772 bytes
SHA-256: 38ca0e522c264f10566fd8f9f5c124bdae5fd36c6204e1bfeee9d4d6bbef3686
font_02_sfnt_off00012187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12187 12148 bytes
SHA-256: 1e0f88f118451f65a16006459e2105be7b2e3aa5a93c49c1cb149c9590284b50
font_03_sfnt_off0001474b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474B 16228 bytes
SHA-256: 1cf24b88e90d04f15f42c4cd9089429376ccd328e499d134b0f6755d454ab4d3
font_04_sfnt_off00015cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 18768 bytes
SHA-256: baff94478ecc65a869dae2f6d0f94e694383cb0890e314109468dc66003a39d7

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