Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab586a1cc88c00b…

MALICIOUS

PDF

83.1 KB Created: 2021-10-11 07:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9d559f8767873b1414300ecbae7330a SHA-1: 5e0a636131085900bb7dde012c9a1905238b9abb SHA-256: 4ab586a1cc88c00b8514b9f6c3be9d9c85c4e2b87fb72fae7ef40087758e9262
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV detection and ML classification confirm malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5771

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://allytemp.ru/uplcv?utm_term=beagle+yelping+in+pain PDF link annotation
    • http://crediramasrl.it/public/file/76220164338.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/78382085705.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/84685300144.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/10352161014.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/mezosekidozupifunube.pdfIn PDF document text
    • http://tianjin.relieved007.cn/upload/files/35545463181.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/12446961999.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/79727456851.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/5057139172.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210904020303_1779116553.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/87883959169.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/24669803106.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/83521981467.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/64117122262.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/segipirokodisexilatezajo.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/52268337909.pdfIn PDF document text
    • http://dsfly.com/uploads/files/20370468182.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/89737251674.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/18288813300.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/66056199977.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/murabumujegupep.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210913213450.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/15722294397.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/11449075699.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/81625306451.pdfIn 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_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10108 bytes
SHA-256: 2a625af524c70a1d703b4c348cb3a57bced0f45ca56127bf349a9172c2584fdc
font_01_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 17944 bytes
SHA-256: ffcae8ba94bc9ace5c327bb1bcf3924d7566ed4bc2d5fb81ac1a21ab2ed0123b

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