Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b71fd5672cc091…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 05:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 978401b54b6f17d1cf21b80c0abe711b SHA-1: 2535c51b8c1085959d1a1865a69510049c0827ce SHA-256: 06b71fd5672cc091d2adfd304913258edce02b9921d0df66e173dc965743f0dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://lynxauto.ru/userfiles/file/3434023224.pdf In PDF document text
    • http://clinton.abwingsmd.com/uploads/files/fokanosifopuxafegaso.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/86087858973.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/sowologojinela.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316f60ca0ba---murezifejiwagotumu.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090822033387.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/jogopisowovuvikasu.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/kivotovarawegipesobuworus.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/fonejumoboxulipimubada.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/13335721384.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/vusonokobenap.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906042938_327400010.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/mufosigazunizavamawejobu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1b4a432ec---49239379140.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/zarasu.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/sefufawesefu.pdfIn PDF document text
    • http://gro-felix.si/uploads/noliri.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/liruritujovem.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/vitijesudujaten.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/9115363878.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/pefupob.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36721344280.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/mugujuke.pdfIn PDF document text
    • https://wasael.com/userfiles/file/18091149824.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/79781793137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=grand+san+andreas+apk+dataPDF 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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 10260 bytes
SHA-256: b74fea06ac4189e1935d24d9f4f6047df6a0c39867e04d39afd8e83d77d1d5a4
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 17360 bytes
SHA-256: b5a95c3271613ff9d169cefbe66ff63a089f746d553aeb98f65acb4dac7cc8fe