Malicious PDF — malware analysis report

Static analysis result for SHA-256 911beb052d13429b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 17:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 263cf6968285ac09f6f4cdb58e5204e2 SHA-1: 99b1b1fcee86958d65c65f578e3ca23688c2c67d SHA-256: 911beb052d13429bbecd2f2858bd3061b0005e7003c1b99abe6bfde7dc718af3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_QR_LURE' suggests the document instructs users to scan a QR code, a common tactic for phishing or directing users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bisleri.genefied.co/ckfinder/userfiles/files/96671871934.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091023594375.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/2547864854.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/16125378099.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/tiwelazok.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vidilobakedagafovasabilud.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/siluvaviluwifow.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/zexerix.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/78620745265.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/91908132696.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/vopobipenedatikanem.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/76445681306.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/41061523314.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/21620143276.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/28960615693.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219111727141621.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5141afd401e13eea42e9906f8a19f4b3/32214220551.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/11380594415.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d62ef7a---tafozonogilef.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/19758802615.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/bulukubesuxowululop.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+scan+qr+code+in+android+programmaticallyPDF 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_off0000c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CB 17556 bytes
SHA-256: 54ecea9bc058a8a29328817d1c586f5d3ebebc990f681fadd47b021c63a67bf2
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 11196 bytes
SHA-256: b6ce9e65a364106dd50bf811fa635afecd1242788dfd1938d90a4c7acaf11d64

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