Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c26575da29b875…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 04:51:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5ded06f8d5eba42d7e3c266bdc5f8be SHA-1: ac52d5d0af62e285ae06f0f46b77ac41b656f4db SHA-256: 28c26575da29b8759fd699ca8c2713ff3c2ec23d2178a8527826187771a6eb39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with one pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://golowaki.ru/award?keyword=atkins+phase+food+list+pdf PDF link annotation
    • http://jebebixazonutug.mypressonline.com/is_there_another_book_after_call_me_by_your_name.pdfIn PDF document text
    • http://tenipimutav.mywebcommunity.org/how_do_you_reset_the_echo_dot_2nd_generation.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/bissell_deep_clean_professional_pet_carpet_cleaner_manual.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/casio_g-shock_atomic_solar_gps_watches.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/ketunetugo.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/59410702399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/764f5701-ab0d-4789-92a6-44f5af0e893d/vizio_e231-b1_remote_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd7ba81-28b4-494e-b2fa-773ab5c56315/403826611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc2f6c6-4bea-406d-90c0-2869433dec23/how_much_do_starbucks_baristas_make_in_colorado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5fcf28-d47e-4b9f-86f4-f8d14a48222a/sigijixogila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6dae04-7a9e-4bf6-b3e2-dcefd18d01cd/pofojujapasuzodiv.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/biohazard_4d_executer_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/kogama_brasil_apk_pure.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/uc_browser_pc_softonic.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/59191608659.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/mcgraw_hill_education_algebra_1_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/74475093863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db74d995-40e3-44a7-9405-aeaebd393e2a/rujivajofoximasovewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b17f16-587c-420d-9c1f-95155ed6db86/19190733751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38af2d7-b45f-43c5-ba1a-433243595708/86244214478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fb7527-f582-4a8d-99f3-8f4510651842/vebatorugidofasozubeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef70aa22-6687-46d2-be61-a3eea9f5828f/can_you_replace_a_battery_in_an_ipod_nano_4th_generation.pdfIn 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_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 5088 bytes
SHA-256: 1d64ec68c0c2fdfdeec42c98e74fb6f1f6f7a16c945650dfa91174ea441ef6b6
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 10684 bytes
SHA-256: d812553be92697dc2562ad8c4e7abbdf7336989856fbf593a061252c3d04c2b4

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