Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f75c7f2f8d9259…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 05:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69d40d2bd7c75709e15efaa57d1dcde8 SHA-1: 8f8c96ffe7ae399b535d031f16c52675f981b59e SHA-256: 79f75c7f2f8d92595970a36965e17b51cc90f96c18962391bb99352c0922f246
146 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, some of which point to potentially malicious PDF files, and the heuristic 'SE_CALLBACK_LURE' indicates the document body likely prompts the user to make a phone call. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.supair-lux.hu/ckfinder/userfiles/files/87200551698.pdf In PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/mogigajoxetirifomaluved.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902085404.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210917045725.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/6134651330.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/25016576480.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6d163450ecf0cf9de67cf7482f56dcbe/26456370395.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/darovinituduvufuri.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/14600574478.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/jorobelowudo.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/96290812589.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/76621731873.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xutuxujezamerofegin.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zobegexofosik.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/36507406226.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210920082130_15isxa.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/jipolofereligodanu.pdfIn PDF document text
    • https://norservis.info/files/files/13051648185.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/13921144199.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/5806104041.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130faa523866---waxerixogaral.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/88808394831.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/gofaduvago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ball+blast+mod+iosPDF 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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 10268 bytes
SHA-256: 2a35a120ec1d414b8961ce01414e923e70a9f7247619b9a387e0d189f704595d
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 18648 bytes
SHA-256: afaf55d226dbce4399b12925da2a68f46df52b9f6428bebfbcb01cd39861dcc7
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1