Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed8fe830ad685e0…

MALICIOUS

PDF

98.9 KB Created: 2021-04-04 03:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d0ecac5ebd2aca183c21655fd5953336 SHA-1: e90a5f29fbef4df7587052df76f9369621388597 SHA-256: 3ed8fe830ad685e0c4325dbe7023c9cd789650f002046eb4fe8661365d8af51b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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/award?keyword=an+astrologer+s+day+by+rk+narayan+pdf In PDF document text
    • http://witikotuxigere.scienceontheweb.net/oxford_latin_course_book_1.pdfIn PDF document text
    • http://virona.org/audio_songs_new_tamilfhhfq.pdfIn PDF document text
    • http://kopalirigel.mypressonline.com/how_to_remove_pimple_marks_fast_in_hindi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6018e7c8ba92e.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/jjCibBQ/water_stuntman_simulator_2019_3d_water_park.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450746/normal_604404ce3afc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_6064aae921df1.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/ifFiigd/vujena.pdfIn PDF document text
    • http://glossywp.online/koloxarefiy3wy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382771/normal_6005afbb840aa.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/0Jhalgc/gram_positive_bacilli_spore_formers.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/dejepariwimusuxegikaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6033530016a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_6014f4774a46a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5ff27c9d7df85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405904/normal_5ff8fb5ebfe01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446174/normal_5feb34232026e.pdfIn PDF document text
    • https://cdn.sqhk.co/libabafo/ggifuzL/sda_zulu_hymn_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_6001011b8336e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_8375b26fb104437ca4f8ed86248a8bb7.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_3c3b90ff066c4f4a89c365bbead344ec.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/merger_and_acquisition_case_study.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/bobbi_brown_makeup_manual.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4ededc28af444ea7a4b16f49f9b54101.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_be0e621271b84a3eaa35be266a401d12.pdf?index=trueIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_2f392ff7deff425c895909e1d470f134.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5504 bytes
SHA-256: 43999ac7b2279d68c5a97fdf4ed495eb3eccdfe1e16be4f9847a86af05e080b7
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 15532 bytes
SHA-256: 85ebcdfdb537d6203568b0c37df1c3d0b989f865217bf0e1d9ef6c6a7776c473
font_02_sfnt_off00013b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 10764 bytes
SHA-256: ccb3f1342f2ff366a22fcfe31e5c94079903507f0877e211ad950751932cc660
font_03_sfnt_off00016092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16092 16456 bytes
SHA-256: 73f9b469fcc2208db6894d2cf0ff8e6568448e2a5ed884c0f1d4b4013312f09d
font_04_sfnt_off0001763a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1763A 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df

Open this report in the interactive analyzer, or submit your own file for analysis.