Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c446415ae6774…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 14:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 636e846c856600c54f0cc1e2d82ab618 SHA-1: d603fa6f6e61634d616550fffad4911f4239c542 SHA-256: 507c446415ae6774522ab55210b052e0afd9e702957e3f6488e776029254bc2e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body mentions 'silent ghost apk review', indicating a lure to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=silent+ghost+apk+review PDF link annotation
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/pasitufuja.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/5030525.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/piber_vivokubugamoput_levuxi_sudumi.pdfIn PDF document text
    • http://sluzhba1.net/dishonoured_2_jindosh_riddlekstj8.pdfIn PDF document text
    • http://maslovauto.ru/gun_builder_elite_mod_apk_2020r46pa.pdfIn PDF document text
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/8522845.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/151755568.pdfIn PDF document text
    • https://jejusutib.weebly.com/uploads/1/3/0/7/130740078/galififu.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/xedejupixowemo.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/noxijogod_dabowero_toposisudazovox.pdfIn PDF document text
    • https://nibawomufexax.weebly.com/uploads/1/3/4/3/134371272/6e4cb28d12a6.pdfIn PDF document text
    • https://javisifuwo.weebly.com/uploads/1/3/5/3/135304639/mojipufiwiwexas_nakojaxajitejo_rotagi_kividuto.pdfIn PDF document text
    • https://nubavusixid.weebly.com/uploads/1/3/5/3/135348304/7696187.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/xotavow_bokutemoko_rijaseragex.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/49967350187st7go.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/luworizesupox/40520472435.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 5400 bytes
SHA-256: 254969ab23566b6eca66906bb467c0a04ba27ed3824d09a6635fa09fe9c03ecb
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 11464 bytes
SHA-256: efc9875f25847c7ab0142d64acdcbe4fdec90feb54965f5c5194ba1f7d850297

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