Malicious PDF — malware analysis report

Static analysis result for SHA-256 5312b838bf52e09c…

MALICIOUS

PDF

80.8 KB Created: 2021-03-05 00:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: ad98d6aa43e85287de221aee202aaec3 SHA-1: e80ca80c200aabd1b57eeaa5570668dd78c80346 SHA-256: 5312b838bf52e09cb042dd75c704f3be082b9cdca52d14a7f4e4d1097f01155e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, with the primary suspicious URL being vilenefex.ru. The document body, though heavily truncated and containing non-readable characters, appears to be a lure related to watch settings, likely to disguise the malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://vilenefex.ru/123?utm_term=how+to+set+the+date+on+a+citizen+eco+drive PDF link annotation
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/talerom-tafokise-lebozo.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/dirilobu.pdfIn PDF document text
    • https://simokatojerosu.weebly.com/uploads/1/3/0/8/130874490/8284028.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/zigirovorobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_419e41294be945b5b17613f5bb5ed854.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/gopro_hero_5_firmware_update.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_71995ac336814e9588feca2225dd1b30.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/makhadzi_madabadaba_song_fakaza.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/88678735098.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_0d12e7de72434573bcaa31f347f77c38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifomi/ccna_version_6_espaol.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_42ab8817a095470bae79498f37930b10.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_3ad337706e924ababa348a431afe8144.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_7579ad8778b7429b9ccbf8ee67492033.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musokejixami/viwerigin.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/grapes_production_guide_in_the_philippines.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_5fc5b28e263f4479800787b10fc949a0.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_f31aec7dde414dca870e4d91ee360600.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_aa37b47f53af454ca8252be907a0c63f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/parking_fine_appeal_letter_template_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/74862478396.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_cc3c17912cae45a79adeb1b922e4c05c.pdf?index=trueIn 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_off0000fec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC7 5156 bytes
SHA-256: 7f4beba1bfd11f5285cd8af0720f3b7c7c0ffe4a783d94f2ea530d31c94d9332
font_01_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 10972 bytes
SHA-256: 775fee0f58d4365e88e5ca65be61ec54a8061d478e6b9ea54b3e6c1080582e64

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