Malicious PDF — malware analysis report

Static analysis result for SHA-256 56426764f668da35…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 06:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1b7c7f08737c702a0f5a1ed19543d11 SHA-1: e764962574e6a2bf86e9cd2311c3be86c472f860 SHA-256: 56426764f668da35ca98f390118fd24b3fa9aa59ad00a371ec6b414b01ce05f3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://dafemum.ru/wix?keyword=rese%25C3%25B1as+de+libros+en+ingles PDF link annotation
    • https://sibezabivodigif.weebly.com/uploads/1/3/1/4/131407310/30294b934f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fc66493152cf.pdfIn PDF document text
    • http://study-english-05.site/24712405138o4wrk.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/how_long_does_it_take_to_become_a_nuclear_physicist.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/christmas_piano_music_free.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/java_tutorial_point_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_60125897dd8b7.pdfIn PDF document text
    • http://ogranifruit.space/which_pressure_washers_have_honda_engines7jdbz.pdfIn PDF document text
    • https://zanokelalugabu.weebly.com/uploads/1/3/5/3/135315143/252428.pdfIn PDF document text
    • https://vofaxarexokuj.weebly.com/uploads/1/3/4/7/134762848/gudawa-fukamurog-gozarapogakol-kijijip.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwodemo/chgdgeQ/draw_it_too_avengers_hawkeye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601af54949b37.pdfIn PDF document text
    • https://jasiximipiz.weebly.com/uploads/1/3/1/4/131453573/rekujobum_minosiki_komogib_gilitinabase.pdfIn PDF document text
    • https://nosobafib.weebly.com/uploads/1/3/1/4/131438228/4221685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_60395505a9dc1.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/jjmQhii/sinetupep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_603d363d2a133.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/how_to_talk_to_anyone_at_work.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/51409954007.pdfIn PDF document text
    • http://regse.website/48753180665z5zsu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_5feaf22f9bca4.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/dnihjbK/nuzorovazibapexesupox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_604711f51eca8.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/0jhLhc5/rolling_ball_3d_2_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 5352 bytes
SHA-256: 101b40f68fe8dd9754b18cecc4b559536361607a4208f3616af5e3324755170b
font_01_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 12484 bytes
SHA-256: 973693f28169762fd041c8357fbe84b63f546e99b297c6aa64472380c71a5f9b

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