Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3064f6d7a78b06…

MALICIOUS

PDF

86.1 KB Created: 2021-09-13 17:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 847d8555f41bc50d1ab3eb7582d29082 SHA-1: 62b07c1dcdf038e3c116376f1fb9ec5d84f0d259 SHA-256: 8c3064f6d7a78b063966b3069434ed00b279702c960d304fc0675b964c839ac4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ostrichtours.com/ckfinder/userfiles/files/gekebokapem.pdf In PDF document text
    • http://wwsm-us.com/files/file/zezobulixo.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/jogalari.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • http://skncn.com/u/files/vipugititifubabopejuvub.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/74748646086.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/80140224803.pdfIn PDF document text
    • http://rem-proekt.com/f/file/puxakodafukolewenefob.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vetilotosewib.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35094236f---27668227760.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/diluwagipowofuvamufovi.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/03/76681248915.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/xisufufawizitu.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/ziwifebuvarizuvumatuke.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/fipesogalavamo.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/42797412611.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/27772129049.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/raxazuzabokatutabufubifa.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/diwarapuva.pdfIn PDF document text
    • https://slotpt2.com/contents/files/77811379864.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/masijatojeburefesaxede.pdfIn PDF document text
    • https://baongochoa.com/upload/file/557555482.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pafaja.pdfIn PDF document text
    • http://cy2hand.com/userfiles/88136598955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=doctor+house+streamPDF 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_off0000e9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 18720 bytes
SHA-256: af7977641762e8d13239286b6c775524b787d5ebf9ec0c12ddb914d3d8f8373f
font_01_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13330 10352 bytes
SHA-256: 89514c6169cb1763046f4e4d55b7ad83c44e9639747b386e67ff53169fcc7eae