Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb39a1386bbf370…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 18:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5cffd13e0cccfedbb86fdbcddbcdc07b SHA-1: 8b4ab4357692398b920bc71eae1d07699d6cce06 SHA-256: 2cb39a1386bbf370046e9bf0e7504ca989b38ee7881ccff42cdb0c441c7ccef7
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 0.9995

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://kuzutuzo.ru/aws?utm_term=what+to+do+when+stock+market+is+overvalued PDF link annotation
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/zefotuxigiki_dexilafapoton.pdfIn PDF document text
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/sitiwevoxed.pdfIn PDF document text
    • https://fuxijisolano.weebly.com/uploads/1/3/5/3/135348953/suwavepegoribabaz.pdfIn PDF document text
    • https://temonobulap.weebly.com/uploads/1/3/4/5/134592988/gerovifajovo.pdfIn PDF document text
    • https://jebupamix.weebly.com/uploads/1/3/6/0/136098333/vifozusona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461232/normal_60530e251a0f4.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/4007332.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/4554453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422368/normal_5fe403a3aa640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/277d0ff6-3256-47d6-8f49-2556e5bf43d5/debuzukejajokewefuvof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6507986-dd89-42c1-8f94-a19c85a72615/31700591070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4178d3d6-140b-450f-abc4-f24c2ae262a4/important_quotes_in_chapter_11_of_the_secret_life_of_bees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc373832-d405-4a06-959d-64b637e093e2/iomega_ix2-dl_firmware_update.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_75d354e51f3f4103a50ee4c222c03ea5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f53413-f185-4741-b78f-1d6f2dceebcc/how_to_read_aviation_charts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0150576-a669-4047-ab07-01a8100d8b92/python_list_comprehension_two_for_loops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caed722-bb4c-46d7-bfaf-54d799c2d4a0/gibuwawupotifukem.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_6291f715728d45f9853fc782edcccc13.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_1825e3ac0781420e9fd4aab0aa916a18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abde0f50-78fc-4bf5-8ea1-ee6345d88c90/65261789189.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_9226838e47554946ba2eb21634c4daee.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_657b59c7d84349f3ba19201ceb5aeba6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5292 bytes
SHA-256: 773f06a564b2ac21c24bf519b3c84ab3f3a11636d53c6a47effcf81e3d1f82f7
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 11012 bytes
SHA-256: 2b5ef750ebd95b11e0374f06511893328f2e408660df063976ceeb3a6526dc4e
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c