Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22b4487494634be…

MALICIOUS

PDF

109.3 KB Created: 2021-03-08 16:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: e8f80acf15cd38adbbb4d8fbbb67d74f SHA-1: 53dea4896275d9eef2fcd0d122227d25d2cd0ba6 SHA-256: d22b4487494634bebeed1a4c1af33ba9cb1851acb58612b8fc67f4aff111ce26
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded links, with several pointing to disposable hosting and potentially malicious domains like 'midufefew.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

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://midufefew.ru/strik?utm_term=best+million+candlepower+spotlight PDF link annotation
    • https://nukivobiwej.weebly.com/uploads/1/3/4/0/134016752/wemafesixenasog_xomuvogos.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/blue_bossa_chords_bb.pdfIn PDF document text
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/5160513.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jjgehf1/baleful_synonyms_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_601658d726da9.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/kannada_bajana_padagalu_video.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/sorevumuk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/jB2ghhh/guess_the_rapper_2019_rap_quiz_answers.pdfIn PDF document text
    • https://moxuranib.weebly.com/uploads/1/3/4/3/134345095/b546dcc1837538.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/xixetetosufaduk.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/42966110934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388839/normal_60000b333add0.pdfIn PDF document text
    • https://zumugerajezu.weebly.com/uploads/1/3/1/1/131163828/guxelusuger-wilove.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
    • http://retiziwo.myartsonline.com/reading_comprehension_worksheets_grade_5.pdfIn PDF document text
    • http://kukelemut.epizy.com/fisudimuweve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6583a10-30fb-4037-8c6d-605684ca41be/70346629991.pdfIn PDF document text
    • http://sisudol.rf.gd/what_auld_lang_syne_is_all_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdcd7eef-6fb5-44c0-994c-c2662576f852/pesifujepemobeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4aa127-176a-453c-9286-762bcbd82e58/honda_gx160_pressure_washer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ea81a1-45eb-4d09-9b6c-caf71c68c07f/vixojimetu.pdfIn PDF document text
    • http://rogomore.myartsonline.com/26662678362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff32636a-d8a6-425c-aa81-fc351e996f7c/us_marine_corps_training_program.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_off00015f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F11 5416 bytes
SHA-256: 166924fe1d6cd3fef49f0ca9f76aa04a7de494a8c26647b95f87919570d96784
font_01_sfnt_off00017154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17154 11960 bytes
SHA-256: fc64f10a08cb608e28f335e755926992b2b0cab86d35a7c8036dcccb074c80bc
font_02_sfnt_off000199af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199AF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f