Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b70b877b21c9b09…

MALICIOUS

PDF

166.2 KB Created: 2021-02-21 00:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 76c892d000fdb1b6e330005183054f6c SHA-1: 31352508bcf9b3431e1ca6c4f5acd505dd44f74e SHA-256: 8b70b877b21c9b0951106df60c8db3b18caef3f7e76d7678046adb94fbfb02c5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary one pointing to 'jacksth.ru', suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains text related to 'piano chords' and 'wkhtmltopdf', which appears to be a deceptive pretext to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jacksth.ru/strik?utm_term=dun+dun+everglow+piano+chords PDF link annotation
    • https://cdn.sqhk.co/fodibaniwe/ihbhdGn/84312364201.pdfIn PDF document text
    • http://checkmycredit.info/22695529885wiqxs.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ibiLjaW/pupepi.pdfIn PDF document text
    • https://mazekijaxok.weebly.com/uploads/1/3/1/4/131453602/2c97efabd6a0f1b.pdfIn PDF document text
    • https://goruwikok.weebly.com/uploads/1/3/4/7/134740681/vajezoberem-latesisi-fuvoj.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/bh9QRbg/83631352472.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/wfNjcje/16514913942.pdfIn PDF document text
    • http://xigegojaliku.iblogger.org/enterobacterias_oportunistas.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/chiChax/bloom_s_taxonomy_verbs_for_learning_objectives.pdfIn PDF document text
    • http://minuette.me/forming_and_solving_equations_worksheetmcpeu.pdfIn PDF document text
    • http://ca-manalapan.space/general_engineering_questions_and_answerspw9wu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapixuxiloko.epizy.com/android_10_update_paused.pdfIn PDF document text
    • http://zazisuj.epizy.com/funny_movie_maker_app_for_iphone.pdfIn PDF document text
    • http://gagavig.rf.gd/80455956273.pdfIn PDF document text
    • http://vanofasara.epizy.com/vba_set_sheet_name_cell_value.pdfIn PDF document text
    • http://vofoxefubi.epizy.com/17612198697.pdfIn PDF document text
    • http://kelakubusadifi.epizy.com/govanalo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000254ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254AE 5484 bytes
SHA-256: 032ce9d7fccdcedfc735f08657c0ffa31efab05cf4d939c1396aec947c4d1496
font_01_sfnt_off0002676b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2676B 10476 bytes
SHA-256: 606842dcc99f1935fd04fbe0e80585ea384d2c0eb19a0d36c7ab9e23ee10e8c3

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