Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4e61dcd85d7955…

MALICIOUS

PDF

63.6 KB Created: 2021-03-14 15:27:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c922a345ab7012f8ad887b423e030d39 SHA-1: b3b135c2c7448c4187a74e1f8d82523c1ea56f85 SHA-256: ad4e61dcd85d7955c0db3cfe1d8f773f37f05d5110feed886da378b861bc95a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=sonic+games+unblocked+weebly PDF link annotation
    • https://sibezabivodigif.weebly.com/uploads/1/3/1/4/131407310/bavudazitox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_603472e0b7c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_6044d6b1cc52e.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/citizen_eco_drive_skyhawk_blue_angels_instruction_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_5fff37a45ea9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60217f43bcd4e.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/jefon.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/4305900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443804/normal_5fda592fb90f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_601a9c2212540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5ff2c69fc439d.pdfIn PDF document text
    • https://bodupojuribun.weebly.com/uploads/1/3/4/7/134758420/tixekowutetiso-sixirigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fdbbdace8111.pdfIn PDF document text
    • https://vilavabakawo.weebly.com/uploads/1/3/1/6/131607043/sugubulorulo_toxekeni_nojebulenuvat.pdfIn PDF document text
    • http://tawesukosipot.22web.org/23821910448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_4cb2825bac4e4de79ec06309eec9a357.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_8bfcd10d00794ac48f490fa3132a8ed7.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_off0000beca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECA 5664 bytes
SHA-256: 79f6cce67eba56263933e75f8bc89a3055efd29d378adb9a3a937af6656ecb1e
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 9140 bytes
SHA-256: 4600f2d1a33cfa0992a38004cf87f74177d45e709bc44bcff6e9f559a8726b48

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