Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f45a5b936a6089…

MALICIOUS

PDF

78.2 KB Created: 2021-05-14 10:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8adf2db6a0e4a0b5aed301c05351d4dc SHA-1: 13dce060d6f39610e2f8f045befdb1376f36ce4b SHA-256: 23f45a5b936a6089cd35ce87341a5d9491cc2c52f52e4a54374818cd780981b3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+attach+hand+tool+to+hoover+steamvac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403141/normal_6065dff828f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450350/normal_60302f2e73efa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_601af7a6cefaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_6034d914b997f.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/ea370969-c1f4-4e36-8191-58487ef47d2c/simodenetokodolodojazap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becce0ef-45ce-49d1-b9d4-d35a57124867/dapep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02246938-cd85-4e7d-9d2a-fdb9e75b2a30/48780930260.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_a0ad2593983149e391d490e9bd62bcfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/370316d3-3dd7-4160-8689-9dbd1e9aecb1/how_to_know_if_a_diode_is_faulty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17198b98-877d-4f89-81df-5a1f0b504caf/75413515849.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_135c4379646e4b80832092d21938e6df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9961d431-c913-47b5-99f1-e1ea1facfcdf/how_to_manage_change_in_education_on_facebook_without_posting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cf920a-0867-435c-af91-5a054807cc0e/vajodilusazesetagex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab03180-0774-491c-a568-8a2a9dbf7b4a/gegevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31585471-46f2-42e4-bb8d-b7878fe6627e/types_of_causal_comparative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5287a32c-5d83-45be-adc9-689349a1eee2/infinix_note_7_price_in_pakistan_6gb_ram_128gb_rom_olx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ea0580-de13-4618-bc80-5ecbed85a7a1/back_stronger_than_ever_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d683dc3-89cb-4cc6-b03f-7c3d021ca210/hp_deskjet_2132_printer_cartridge_price.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_d2e562cca4cd4e3d875166d13e100c99.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_48cb53fcb57b4369bb9a5739f7826d5a.pdf?index=trueIn PDF document text
    • https://ef9d90ca-5811-4a1c-810e-75bcfae60121.filesusr.com/ugd/a33af7_64224bfe97e041d09dab23ddbc0004ce.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 5292 bytes
SHA-256: c4606109d95e6db0ce5a1b03ba644cd11cf5227fb72f1ececdcac32ff8d17145
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 12644 bytes
SHA-256: 52a61d234b3482d20437946155717e3c855e9afdab64bbc392cebbad96308f29

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