Malicious PDF — malware analysis report

Static analysis result for SHA-256 104fae1b7ebfbdfe…

MALICIOUS

PDF

117.8 KB Created: 2021-05-31 02:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e4a07bfa67592c5aea62344291b20010 SHA-1: 64f88b033f9fb27a2fa7ddf59deeae9b078f5d67 SHA-256: 104fae1b7ebfbdfea5860918d11a75ef526025c64992d39b8dbb188d7fcef0d8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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://kuzutuzo.ru/123?utm_term=biblia+reina+valera+gomez+pdf PDF link annotation
    • https://xikuvisaduwobax.weebly.com/uploads/1/3/5/9/135962120/d82f0880f.pdfIn PDF document text
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/gokime_rupexupuzusak_fajonufabagul.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/05e3d.pdfIn PDF document text
    • https://gedibaforajipet.weebly.com/uploads/1/3/0/8/130874683/fevofosebu_gemexu.pdfIn PDF document text
    • https://zimatesuti.weebly.com/uploads/1/3/0/8/130873828/2757351.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/78ed0fde1.pdfIn PDF document text
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/c7ea7ef04.pdfIn PDF document text
    • https://gugukipibedi.weebly.com/uploads/1/3/1/4/131438190/rizajovegudip_pupipare_votereva_zatenedaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_603365280c6a3.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/43c00f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fef19af405fa.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/gobulisewazuxekataj.pdfIn PDF document text
    • https://niladomawinur.weebly.com/uploads/1/3/4/8/134875702/af01140d174a24.pdfIn PDF document text
    • https://juderesovabivov.weebly.com/uploads/1/3/4/6/134680251/fosugadexusofu-ferokevimuxa-pigamafagavix-gowag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_60387bcc0e622.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/f8497662-8a7b-42c9-bb28-239f1f5e2ca4/94505806574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f269c6-6327-4d88-8043-5f0d26608f47/husqvarna_riding_lawn_mower_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7740d628-9fbe-4cdc-930e-358e499109ad/vexanonuwowoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010e1234-2de6-4855-9254-ad3f00d1215f/miss_adele_amidst_the_corsets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a231de8-4280-4cee-ac65-dab7e3061c52/how_much_does_cdl_school_cost_in_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4af23e-39b6-4d1c-8dc4-f557d7cc49d6/8036916210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c2f7dc2-fa58-4301-b52c-0b10a64e5958/what_size_battery_for_cvs_digital_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a13b6b-4e88-4883-875b-d818328cfff1/coreldraw_x6_free_download_full_version_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366f6504-28c1-46c4-85a6-768868f61832/st_augustine_confessions_book_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97806d3f-cc10-47d5-bff6-696bdf223a26/les_misrables_movie_youtube.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_off000183b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183B0 5192 bytes
SHA-256: 95d14ad4a945840a172ffa98d436fe4fc1f5395ef14fb0452426efa169cb6e11
font_01_sfnt_off00019536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19536 11572 bytes
SHA-256: f92d2503b4705c669dffa2f9d36b40a47bded5aeb0c1d3c10a4081887af1a8c1
font_02_sfnt_off0001bae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAE1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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