Malicious PDF — malware analysis report

Static analysis result for SHA-256 051eae1b5bb9cbc1…

MALICIOUS

PDF

105.3 KB Created: 2021-09-19 03:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2a541b952ded825f8fe1054fd14a4ef3 SHA-1: 08ee0f81b6cedf44380d9f7fd93820f73505fde2 SHA-256: 051eae1b5bb9cbc19b286f3e434ae21efcd1fc4d150fb0972af11021191b1e34
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crysiq.ru/uplcv?utm_term=advanced+grammar+in+use+supplementary+exercises+pdf+download PDF link annotation
    • http://ktcz.eu/files/files/solidanaxewov.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/wuvuxawaligog.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/11136387925.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/89042454263.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17004c4e2f025af4af42c0d99531be2/83732725108.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/dimewedonukuvipuwepomali.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/30787233464.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/12514544580.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ea47dc69bb8706b235227ad1f287b2e8/xuxodiwok.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/54918235448.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gudejeratawez.pdfIn PDF document text
    • https://protum.se/file/97120599267.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/geluzoxatabopibolux.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/60229711688.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/puridesuxelofedakud.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/57348888937.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tajunijodek.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/17563363972.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/42451604386.pdfIn PDF document text
    • http://taigesw.com/upload/files/vimamusasivizoxibilikiv.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/30845153265.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/tamemu.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/linowunawanimaz.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • http://rurisnet.org/images/file/90802631060.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_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 21056 bytes
SHA-256: a7d158fbdfd34a0100776594e4463c9cdd2ad4d3c547240def00fd3acde8078e
font_02_sfnt_off00017c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C71 11412 bytes
SHA-256: 495cf02733b451f3c6496b8418ffca5948534ebff1fcfc92ee06374c42efdf74

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