Malicious PDF — malware analysis report

Static analysis result for SHA-256 564e7d5b14640b22…

MALICIOUS

PDF

84.2 KB Created: 2021-04-25 17:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7956602525fb3d91dd2811f982e65ed4 SHA-1: 506d722bbf240b27591cc1ce3fc12cff4e3d2e6b SHA-256: 564e7d5b14640b22088b7b77635a1a0af1881593ab3aaf802da6cb6bb5cf9e16
186 Risk Score

Malware Insights

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

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 0.9997

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://jumiwimov.ru/strik?utm_term=how+to+check+my+system+specs+ubuntu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385198/normal_602ab99720c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_60141fcdcafd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_6023d79cb5a59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fcb21573939b.pdfIn PDF document text
    • http://iceteas.space/charades_rulesyag0m.pdfIn PDF document text
    • http://supportcopyright.net/pewamidabisikutewaxerow6j2e.pdfIn PDF document text
    • http://virona.org/lumugotoruwu2432o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_962fb15b63b84704acdc6f83c7cb2667.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/9341629291.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_0f55501bd4544a339bd23b820af777fc.pdf?index=trueIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_ea21163bc1764505ba3148065b1b82ad.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_26c96de774bf449b84eaf9e306a106d4.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_52fe583717174976a7b07c0a2c9283c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/acer_aspire_5532_bios.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/2006_mercury_75hp_4_stroke_oil_filter.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_a391ce97dd9e40308b3f4faae1fda37d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5b6b1c-2098-470c-bf20-bde4b1aaf613/the_dark_tower_7_review.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_cda047f377b64b5ba85ad6dc15a344b3.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_cd8a528661774a998102e22b1485f073.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/crossfit_wod_double_dt.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_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 5192 bytes
SHA-256: 33ed067892d8e557c18bbe0ad1c20a0dd83bce1140e5330a4d499e8753bc8cac
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10868 bytes
SHA-256: 5fdc2287a6c976fee72bd09a7af63f5a3a1f85db19de40bd6369d07f35df3d9b