Malicious PDF — malware analysis report

Static analysis result for SHA-256 49324c21e579cf5e…

MALICIOUS

PDF

74.3 KB Created: 2020-12-19 10:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4145c0294d5c92035d81c3f83efce5af SHA-1: 2a3384940130165e5d2a436945a07990bef84314 SHA-256: 49324c21e579cf5e3ff9845027c6b4916e05fce8d0b03af55eaca60324efd4c6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. Heuristics indicate it functions as a link farm on disposable hosting, aiming to lure victims through deceptive content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=cpce+study+guide+pdf In PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/nipexuxirobaxim.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/vegeruvirer-bukafobagila-newujigix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5f9e16d554638.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/5601821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5fb4acd6a04e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fd68ce44f5dc.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/mixubuf_zogava_fupavilora_jufimuf.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/bazoliv.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://s3.amazonaws.com/xetasif/chapter_2_kinematics_in_one_dimension_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03a2308-656b-4010-878e-17664a555182/mipugifewi.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/the_unknowns_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f43873a-31f4-48d8-b97a-b6c2f77e5eba/water_chemistry_mark_benjamin_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/battle_royale_pc_no.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bofiwududubito.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/simple_past_and_present_perfect_quiz.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_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 4776 bytes
SHA-256: d66f3ce2364bc3724c449cc3b05a62ed8fec0fa38feeb18d2a633d122220dcd9
font_01_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 11248 bytes
SHA-256: 6a19430f2f745159a31d72a5fbc5f1cec4ab1683eaa057132468ed971b5b3cb6
font_02_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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