Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30c63088cdb3eb4…

MALICIOUS

PDF

81.0 KB Created: 2021-03-14 00:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 783db7c76d8dfa11d1dabc8f4d9eea71 SHA-1: 78a9fa06e76bafabeb69584cd3adedeaac9ad205 SHA-256: a30c63088cdb3eb4a82d97758e9b3ff0faeff90e4d838605d4302491db037ac8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to 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 delivery. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=adp+company+interview+questions+and+answers+for+freshers PDF link annotation
    • http://mylic.ru/aseptic_area_classificationp3bkp.pdfIn PDF document text
    • http://theandyhong.com/reverse_bias_and_forward_biasuib5t.pdfIn PDF document text
    • http://bestcreditcheck.info/nanotechnology_book_free88b5c.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/hhgeha8/dulakokadotaz.pdfIn PDF document text
    • http://thecabinets.xyz/confidence_interval_calculator_binary_dataylq3f.pdfIn PDF document text
    • http://baby-slings.ru/salon_fundamentals_cosmetology_textbook_download2zc8s.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/ejaieIp/fefazikimonexuni.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Mijgihd/nfl_playoff_picture_2019_20_bracket.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/fYjhidy/farm_animal_sound_spinner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_69953348f7e548798f471c3c57765907.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_338b5a42b923446385180ff388028341.pdf?index=trueIn PDF document text
    • http://rojaxenutu.rf.gd/discrete_mathematical_structures_for_computer_science_kolman.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_dd866587475f429080f79f07df3ab97b.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_6747222885b8491abc3f8177f80e8f07.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_ccd8d4401260449aae7d840306f2c626.pdf?index=trueIn PDF document text
    • http://zagopemolal.rf.gd/beste_qibla_compass_app_android.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_74ef51b865434d3fbcdd6576d6db0440.pdf?index=trueIn PDF document text
    • http://libiwozurogufo.rf.gd/4_pics_1_word_level_2781_to_2800.pdfIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2ee134ee066344fcb04bc3938d9f3dcb.pdf?index=trueIn PDF document text
    • http://vakewexapenox.epizy.com/gagevuvutimotofit.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/fizudiboruweliwo.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/dividing_exponents_with_variables_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/wabulabupapinumaxeva.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_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 5732 bytes
SHA-256: 101e9ba7082c04225a23c5be2ce76779d7a83b8d4c1cb1b2b9d7ce664ba3676b
font_01_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 10476 bytes
SHA-256: 0f36ca3e75f892f5309aaef503bf9f2e34f63b61f04bfdd72102480569ea327f