Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bebc8108117548b…

MALICIOUS

PDF

89.4 KB Created: 2021-01-25 05:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ee0cc0e6d5826b0532ed9fa79fd7e9b6 SHA-1: 816bbef0104b66fa17c5ccafd3edfc2afb03454b SHA-256: 3bebc8108117548b801027dac2e57fa8265f4619d64a9b29c4a60d0248bfc89d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The primary malicious activity observed is the embedding of a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The document body contains garbled text and metadata related to 'wkhtmltopdf', which does not provide clear user-facing content but supports the file's nature as a container for external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=park+jisung+selca PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413845/normal_5fe7968e070ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372080/normal_5ff70dd642ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5ff20b10b5f5c.pdfIn PDF document text
    • http://boost-shop.xyz/47741690224dej0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_600d62b782cdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_600dfef5101e6.pdfIn PDF document text
    • https://figidurilope.weebly.com/uploads/1/3/1/4/131452961/d30c7352e7b.pdfIn PDF document text
    • http://kernig.store/20238571208wzpf9.pdfIn PDF document text
    • http://jirafka.space/62580833280h5dj.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/5584992.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/5247c029d05625.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/sumowake_zipezikibazetik.pdfIn PDF document text
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/7abee9a00463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fd0917535562.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/5905134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_600d3fb1aea55.pdfIn PDF document text
    • https://wukugisusip.weebly.com/uploads/1/3/2/6/132695501/6aecf23e5d748.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
    • http://bizurano.epizy.com/34552812055.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 3376 bytes
SHA-256: 10255836720c181c98279727db56a1660b6f8cee7f97f8afd005718c76db9870
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 4800 bytes
SHA-256: 7001516a469c09c48df15bc4cd37ecf2be361045b82e0ba84d8bfde228b52f1c
font_02_sfnt_off000100df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DF 1904 bytes
SHA-256: fb65c6a19f8098b382bfe5ba7f07affa28fe2c52013ddcbd16009dd255d71bd6
font_03_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 12572 bytes
SHA-256: 292df4c1f053df4f5c056cc55fac50a2ab86047c6cecb0849049521ec3d8975b
font_04_sfnt_off000132c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C6 16620 bytes
SHA-256: 7ac039226827c4d48936d81ee1f523a36ba6bd02155fb35dac0e6f8b733a5c41
font_05_sfnt_off00014906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14906 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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