Malicious PDF — malware analysis report

Static analysis result for SHA-256 579ea5abd05b6eb1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 08:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8aeb323407145c90a6f80014c6f8776 SHA-1: 17df53090fd2f7d74674c36a9df39ecaf8bd62f1 SHA-256: 579ea5abd05b6eb1fec68798edd23e500d67c47abc895f9bbc2b06c7164aefea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous embedded URLs supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://snapstudios.ca/userfiles/file/zuxijoturukovedabajiwafav.pdf In PDF document text
    • http://alocainghien.com/uploads/userfiles/file/fujijukad.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/18994043587.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/bipilikol.pdfIn PDF document text
    • http://progetec.org/userfiles/files/73848470091.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wivoxikejufozogowefiw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/74907457332.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/29456086404.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/renuwu.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/94165814977.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/tukaji.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tigovubekuwumep.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/digesolizixiko.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/palafalofafopujameb.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/xulolo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/nogevofexataze.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bufolo.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///80452665625.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/87316828390.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/bosejidodisitadofi.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/ninirezi.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/niteda.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bebdeb55b---5763005191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+create+custom+view+tutorialPDF 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_off0000c0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 16656 bytes
SHA-256: a104c83870dce57b60f10d960d66e325cfb908632875efbe9ba0d50ccf3faa60
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10764 bytes
SHA-256: 4233557f8942ba7be4f2fb150babdb9437fbedaf2f3da5f89bedfc30623dcc99

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