Malicious PDF — malware analysis report

Static analysis result for SHA-256 b436e162002d600a…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 07:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c76817a9577c0972743f5c9780908ed5 SHA-1: 53e9f8d4acbfb68c525483f960df2142dd3df1cf SHA-256: b436e162002d600a3cbabcdab94847ae5692faf280bc4355a89450d7a8fecbfa
186 Risk Score

Malware Insights

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

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 0.9995

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://zajinet.ru/123?utm_term=sound+blasterx+ae-+5+pure+edition+manual PDF link annotation
    • http://nenusarawamis.22web.org/53790975326.pdfIn PDF document text
    • https://ruwiderok.weebly.com/uploads/1/3/4/8/134891429/bixuduk-ferezisi-koxujefunapu.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/fozupezu.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/de2631ba.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/0jehc7A/pudawinowirejudivepariji.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/fD1jgtj/verizon_wireless_iphone_find_my_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/jhfTjid/65683483711.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/pafado_pavedabisimi.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/c8fa58c1.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/hegeCBz/javijobubobowezotawezazi.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/09e80aa2-0d5f-4e5d-9476-4e6acc459315/how_to_tune_bearcat_880.pdfIn PDF document text
    • http://binewazuliv.epizy.com/57373883565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d6f07e-6ea1-4443-bc67-f39371edb1c7/que_es_los_primeros_auxilios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbfa255-4a9f-4002-9569-a950a979d354/what_catalytic_converter_is_legal_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/convert_to_word_adobe_reader_dc.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/zuvamulunix.pdfIn PDF document text
    • http://wusasozomumag.epizy.com/liwetuzofavurok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2538af-4daf-4bd2-bba1-e34363370897/how_to_replace_pentair_pool_pump_impeller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6695b56-e7ea-47e9-b8ec-36914422f5e0/49010677424.pdfIn PDF document text
    • http://zopetudivukuka.rf.gd/xazakogugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/invoice_template_freelance_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/adding_and_subtracting_fractions_with_unlike_denominators_worksheets_with_answers.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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 5456 bytes
SHA-256: 07493f7a11f549ef9fff61b848406e269ee6b385b5504b43a7e4fb83f03f0218
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 11280 bytes
SHA-256: 51af14250cc86197360ded061cd4c32074f4afb89aca579fab2c16558d1464dd
font_02_sfnt_off000110cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3