Malicious PDF — malware analysis report

Static analysis result for SHA-256 e988f8ae1423502b…

MALICIOUS

PDF

83.3 KB Created: 2021-02-24 07:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c06bf6cb6da3ecacd73765c47507082 SHA-1: 3bab94efbb918e8ae54b868f4b7218c1cadd8ecd SHA-256: e988f8ae1423502bde2af7a5720462bf1c1a171026c61a63c7388179d476ceb8
126 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=tvb+live+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374698/normal_60321f0938071.pdfIn PDF document text
    • https://fakodide.weebly.com/uploads/1/3/0/8/130874451/vivoda-povomajisawej-xixawow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fdc54ffee527.pdfIn PDF document text
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/fixezexigiviri-tizisedazufu-venato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_5fdc8c4b5ea0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370263/normal_5fdf4fee6f674.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/hPhgihf/gidepezukenurelurimeru.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/da65add0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_602a72a96865e.pdfIn PDF document text
    • https://gifuroromila.weebly.com/uploads/1/3/4/3/134377961/dezokiruzinekoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382620/normal_60000e9fef3d7.pdfIn PDF document text
    • https://cdn.sqhk.co/mixirulizab/LigEugh/super_smash_the_office_mod_apk.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/wirovakisixopa.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/faluzotixupi/peruximojegusutazemuro.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/oster_roaster_oven_directions_for_turkey.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/structure_and_function_of_hemoglobin.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/66277620604.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D8 6792 bytes
SHA-256: 98bac4c559973931d3f8f752ff6c8d9313fe6a8973f2ba95439ad376bf3c5fd9
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 4752 bytes
SHA-256: 208b859b3fd92acf0cf326bb5c05a2ebed5ca48476ca856b1c6614cf6e150a58
font_02_sfnt_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 11480 bytes
SHA-256: 36f5c0c12a06c2de7c1ec14d68c291a9ebbe55c0b51300d40afdc4f68bb6867c