Malicious PDF — malware analysis report

Static analysis result for SHA-256 841d19c4f4e8d490…

MALICIOUS

PDF

91.4 KB Created: 2021-03-06 08:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 08231fcc4d154c3abf3440cb07622037 SHA-1: b59ad963efd1f0fce8054839ed2882806979cccc SHA-256: 841d19c4f4e8d490fbd42b8401b8e53e5e77924d7ceea12341ab31cbc43b74e9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain keywords related to product searches, suggesting a phishing lure. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/123?utm_term=herman+miller+aeron+chair+size+a+used In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc8dca75d983.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/1jcgdja/national_geographic_channel_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6042e5d20d567.pdfIn PDF document text
    • http://takujol.iblogger.org/71774616004.pdfIn PDF document text
    • http://cadenalia.com/java_8_parallel_stream_map_example7xbve.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/j6uz5p5/dizite.pdfIn PDF document text
    • http://rogosevit.22web.org/fidodum.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/h0ggdhj/download_game_princess_salon_2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/jjjcjhg/lusudezexitixiwijov.pdfIn PDF document text
    • http://7evenrp.ru/xbox_360_controller_rechargeable_battery_pack_not_working4iri3.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/gorhfhi/eject_external_hard_drive_windows_10_greyed_out.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/jcZhb2o/angry_shark_simulator_3d_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5ffda7133d633.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/063ad55b-ae3b-47d1-8a81-306616f24869/55128868088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7e6bda-6c57-4647-8916-9406e321e39c/68178543819.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/turtle_beach_xp400_pairing.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_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 4992 bytes
SHA-256: df84b713c4622193172988752b4b5c9a37cc12e34f019cc18ca95abcbf0861dd
font_01_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 12020 bytes
SHA-256: e418a2701faf4bc9e890211f63637af1ec40869112aafa62da855d6c7ded373f
font_02_sfnt_off000150d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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