Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1efe81b8a9560d…

MALICIOUS

PDF

78.3 KB Created: 2020-12-25 07:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6065b6a1e562a14c1f082a4b3d1214cd SHA-1: 61bd72dbbaa7d4935eed76cd1890f7f50dcbb55a SHA-256: cc1efe81b8a9560d2b5c6ad3a7d001eb62ea014b851eec43f132796f1d268a72
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable hosting services and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary URL suggests a lure for downloading software, likely to disguise the malicious intent of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafffi.ru/123?utm_term=gta+vice+city+android+apk+%252B+data+download+200mb PDF link annotation
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/3643135.pdfIn PDF document text
    • https://walupufodurutos.weebly.com/uploads/1/3/4/7/134734499/4ade3f02e.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/96b81ca6d.pdfIn PDF document text
    • https://rifodomofakape.weebly.com/uploads/1/3/4/6/134627700/26ae21941.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/poziraw_kisax_sajivisunapupol_dadek.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/nixomaz_gagaxe_xafelujevonof_woluwapomewema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/electrical_periodic_inspection_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e997526-3839-488b-89bc-2ecefd7257c6/lamezobidalutoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3253b84d-83aa-428a-9aac-214565d2c8e3/corre_nicky_corre_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc6aa6a-6ccc-47d3-9a6c-ead07ad351e6/56734531021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f43ac6-78ef-45da-9733-0bf6bdebbbe3/68836987437.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/89553938925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca13034d-ace9-41bf-a2d5-1866da8c399b/lakeview_elementary_school_cortland_oh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6823b45-4858-47f6-8fb5-9518bef5ab40/bwwm_romance_free_kindle_books_unwanted_baby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b75c3-ac4a-42de-922e-e111105cf8d8/people_of_the_lie_scott_peck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8441de-22c2-4d1b-a9f8-76513b486d67/velasuwojofazosir.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 5804 bytes
SHA-256: 296621c9019605451fe395eca67167c8267308f05cb8879d98e03c9184962681
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 10908 bytes
SHA-256: 4db505038837ef9d31e04de75834cdf8b6d1e25d695a7443efe147596c59bd28

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