Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf8f02e21d43ce1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e283cbf718307dc15cc48c6d87ed8717 SHA-1: 5c5fb04ef5e5f4de787573c691cfc63b307550e1 SHA-256: 3bf8f02e21d43ce1c2e263f3628505c10df45152e9162494d99a590fbc00e1ca
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates it's an image-only document designed to trick users into clicking an embedded link, which is a common tactic for delivering malicious content or redirecting to phishing sites. The numerous extracted URLs, many hosted on disposable domains, further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=should+you+eat+breakfast+before+you+workout PDF link annotation
    • https://kimansion.com/uploads/file/kagumigaxi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210925061118.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/42123198379.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/nuxifutunidifod.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/desusuradaneronawekisuzot.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/lamafinarapo.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090916382274.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902165552648553.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xesumiwigutitaxaxe.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/napamiwulipu.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/7742215253.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/56415611569.pdfIn PDF document text
    • http://infosierra.es/images/editor/4497457570.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/7253295915.pdfIn PDF document text
    • https://cargotavio.ru/files/file/koguviduj.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/45481396559.pdfIn PDF document text
    • http://webbuilders.com/files/file/34746890206.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3dac717b---murewazeleku.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/xuxuminox.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/rexoxegasibivepobelixef.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/53628653625.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/zisikubirewin.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/17785091882.pdfIn PDF document text
    • https://eternalbliss.net/file/tejuzudevepuzezuzepexi.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/68801354159.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/71194766852.pdfIn PDF document text
    • http://airmon.hu/images/files/basupafuwozesokenisok.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 14088 bytes
SHA-256: b2f684c7d2520c724e058497660f1a90c0f13eadbc1ced70bdfe077bbfa1cee8
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 10864 bytes
SHA-256: 124de36e3f8c57ca7ec4f0ef8deea689ce2f435f003540024e7ec9dfa8962dbf
font_02_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1