Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b0f50a5bcc7417…

MALICIOUS

PDF

79.8 KB Created: 2021-04-23 00:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 785cc85a7ae7181e32a0e3c21969a010 SHA-1: 5544c2d4736dd6765731efa04522d6e38d877ec3 SHA-256: f8b0f50a5bcc74172f8deb90f03881698028fc0911076f13eff2be6283334981
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains text suggesting a search query lure, and an external URI pointing to 'vilenefex.ru' was extracted. This indicates the document likely serves as a lure to redirect users to a malicious site for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=can+you+look+up+someone+by+their+license+plate PDF link annotation
    • http://leoidet.xyz/how_do_you_calibrate_a_digital_torque_wrenchdhuke.pdfIn PDF document text
    • https://kapiromus.weebly.com/uploads/1/3/5/3/135345701/d9733422cbe35a.pdfIn PDF document text
    • http://micrometer25bill.site/vafotuwujugotawodtczkz.pdfIn PDF document text
    • http://dream-stat.ru/depogizesajukipa5uk39.pdfIn PDF document text
    • http://tryici.xyz/88881869918qxj5z.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/76115899826.pdfIn PDF document text
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/3247504.pdfIn PDF document text
    • http://lngcliente.com/ravagadizararu13tvl.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/objective_c_tutorial_for_iphone.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/bapepelomipaginerupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d885a672-5912-43ac-b86e-7533377533eb/zebedego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f9a339-6773-45b7-9858-b39275aaccef/bionaire_cool_mist_humidifier_review.pdfIn PDF document text
    • http://mojogoralil.onlinewebshop.net/safety_valve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050b3de7-1c2d-4e64-8b58-0bf890b50e12/vugifozijef.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/one_night_promised_series.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/39212114247.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/44732395405.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/10653996863.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_da4115a5dda4469baac4ce5c643d983c.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_e17828a13e4947bbbf8f4f6a512ddb8e.pdf?index=trueIn PDF document text
    • http://bupalim.atwebpages.com/29650380959.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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5384 bytes
SHA-256: 5e1ee1b1dae532bb1b27a349da3c298ad71730dcafcf023d6ea0f44796fb2623
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10952 bytes
SHA-256: fe84193e07003a7d847c0a0cf20d60f6ba2dd64ebf069298e12990a21582836f
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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