Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3464e52a1a4254…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 21:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 551288e8efe2d00f974824c7612ecc30 SHA-1: 674f1797b2ce2a0f4d6dac4b20a1a2fd6ac2daa1 SHA-256: df3464e52a1a4254e9c22c9cff8f7e9b40965b1b0fc8f42cdff0eb3a86fb4148
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 or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and redirect to numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=chronologie+des+m%25C3%25A9dias+r%25C3%25A9forme PDF link annotation
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/7942908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_600a57fe8df74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd67c0621f54.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/4d2e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_604677b083c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_600dde3d89a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_6029e01ba5010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_6031da1428fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_600e83ab4f995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_60be00a571c63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fef5a0476326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_606c29b964cb9.pdfIn PDF document text
    • https://gasaromub.weebly.com/uploads/1/3/0/7/130776100/zolelerokowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_60374cdb07966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6046e5fe9471b.pdfIn PDF document text
    • https://wadabugijiri.weebly.com/uploads/1/3/0/8/130873870/3aca10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_605a5f3146ad6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5ff9df4613e84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagidetubi.pbworks.com/f/how_to_pair_sylvania_speaker.pdfIn PDF document text
    • http://barumena.pbworks.com/f/gun_mayhem_2_unblocked_games_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f2ba5a-ade1-48d4-bd00-a99da0604ac8/vocabulary_workshop_level_f_unit_3_answers_vocabulary_in_context.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d477e68-77bb-42e9-bb89-067def144b91/klipsch_heresy_speakers_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbd4788-aacb-4274-b7a5-a696862898e5/hp_printer_3050_driver_download_windows_10.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/station_eleven_mandel.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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 5368 bytes
SHA-256: 3b440b6da6d3e61510ddbda6805c6086af00e9640cefa98461ac0fcbb47b949b
font_01_sfnt_off0000f9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 11984 bytes
SHA-256: e7f952e9f433ac61ac108cbc0eb5185b4f3c021c77cc66ec5d7d27263449f289