Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca96262c94ed358…

MALICIOUS

PDF

84.9 KB Created: 2021-02-12 12:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7730e2e5e7a54b80dfc9629428e268ee SHA-1: f9fbe770b45fa26a693753f97213bb0cb8b4edd8 SHA-256: aca96262c94ed35805ac9c5cdd7ec84cdc7df9970a979f88579a5acf3c15d773
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services or domains commonly associated with malicious activity. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate this file is designed to artificially inflate search engine rankings or distribute malicious content through a network of linked PDFs. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=dimensions+crafts+needle+felting PDF link annotation
    • https://zuborezebakit.weebly.com/uploads/1/3/4/6/134638686/2439066.pdfIn PDF document text
    • http://dusosax.66ghz.com/harry_potter_7_part_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/gcRFWrp/46993600842.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/6970045.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/5422112.pdfIn PDF document text
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/xigusirajog.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/kimuxipuj_vuvozalu_lakifezekajikav_savonelarumaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_6015743726d2d.pdfIn PDF document text
    • http://d-youtube.com/tuber_simulator_bux_hackdkllx.pdfIn PDF document text
    • http://salleop.xyz/zedifotadax52u0r.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/1vghhhn/intelligent_personal_assistant_in_apple.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459784/normal_6008eb4ccbee8.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/ijhgiji/dobijigowuxulo.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/bolovopizonuki/25191406200.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/bhartiya_rail_apps.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001131e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1131E 27760 bytes
SHA-256: f332b8943084918d49169ed572dbbaaf23dde05aa60ba8f435f543f0ac790bd3
font_00_sfnt_off0000da83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA83 5340 bytes
SHA-256: c013004c35fb62c556a2b5aa728ea5b4e0a6953471550a5fa3df8978312495fd
font_01_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 11312 bytes
SHA-256: ddca2f1e59c084faf6d6306a83952af59081dbcf15849a7e103559866741f209

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