Malicious PDF — malware analysis report

Static analysis result for SHA-256 8122bbd979e7ecea…

MALICIOUS

PDF

78.8 KB Created: 2021-03-05 21:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 037296c89c57769cbfcc6be73db2e124 SHA-1: 56419b27ddbd269b6bcac5766548a1d1a5a18593 SHA-256: 8122bbd979e7eceaa7fd1171478767219ee5102734c8f97fec9c4237398a40b1
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, indicating it functions as a link farm. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these external URLs. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=winstrol+cycle+side+effects PDF link annotation
    • http://idealslim-ordina.site/dewalt_miter_saw_stand_wheel_kitcow6u.pdfIn PDF document text
    • http://predouche.xyz/www.perfect-english-grammar.com_present_continuous_exercisefr1ky.pdfIn PDF document text
    • http://salonhq.xyz/akashic_records_reading0zxid.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/fe4ca7.pdfIn PDF document text
    • http://workbykoder.xyz/como_hacer_manualidades_de_papel_corazones3j94i.pdfIn PDF document text
    • http://jsexj.fun/batman_the_dark_knight_in_tamilr8pbw.pdfIn PDF document text
    • http://summ-green.fun/garipetituvebomoscwtli.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/revolution_2020_release_date.pdfIn PDF document text
    • http://avtoshtorki.shop/21383766268kizht.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/47ff4981e06f17.pdfIn PDF document text
    • https://rusizatigaj.weebly.com/uploads/1/3/4/0/134041601/57f9c5.pdfIn PDF document text
    • http://custits.space/kozikizexabegaagab.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/how_do_i_change_my_gopro_hero_3_wifi_password8l1ci.pdfIn PDF document text
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/7110852.pdfIn PDF document text
    • http://blognews.top/nginx_lua_redis5zqpz.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/boy_scout_event_planning_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_86b5b7b37b1a464bb26e23948804bf85.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_0cdacc08d77e42edbed9fd22f4dfd725.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/lakel.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/2009_can_am_spyder_owners_manual.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/36596389437.pdfIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_b2ad86f8511d4f8295367b1f32a65545.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_5376d42fdc6f496ea8bfb6b11dd434d1.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_65ef4a0d1efd43ec82928f08c094514e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 4920 bytes
SHA-256: af71886f6baa0d6a709f82b0718e0af45dce42e7e501f393d2b2b7dd149ba6ce
font_01_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 10292 bytes
SHA-256: e39393a0027cc0ef39810422bdd8f73d87e06babcfbeb8ad46a56d540c3d1c99