Malicious PDF — malware analysis report

Static analysis result for SHA-256 f870315a346f6d90…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 09:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1cccdf97b1ee63302a53815d1b16318 SHA-1: fb30e510b3cb545b33708005a796c689f31b16f6 SHA-256: f870315a346f6d90e69a3d26dfd8fd4383769ffd64563a17dcc5955b34b8d4f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these are likely part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--h1agcmh.com/ckfinder/userfiles/files/33259858352.pdf In PDF document text
    • http://boonfagrandhome.com/user_img/files/90096696257.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/gusexanapufone.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/ginawejuxiwivonegol.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/xedomekavomoxovezofamoju.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/42989239681.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/11949471871.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/78470256902.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1dd687ed71c33bf8bc27db225157bbc4/27909903824.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/regozofotolililejasuzi.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/65551067505.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/52785399320.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/dokikopivozonorupizo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/67397916941.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/suziriganiwovegoxepizan.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/bubaz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d041d6cf0b6f09330c0a9cd5943f7f1a/xisexoxo.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/28127769966.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/79538696752.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/61896360950.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/fubetusek.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/11457243323.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/rinekobejesuva.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/52525524014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tekken+2+apk+free+downloadPDF link annotation
    • 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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10392 bytes
SHA-256: fa9a1abcdbb29f6fe6028d6787754d43593efae4e8c3fd56ae8d3ae6697fa286
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16820 bytes
SHA-256: 7384d31779284c88d641577af5871d8723b3984636c7fc8e21a87346a8b19389