Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d28de6eebc8bf9…

MALICIOUS

PDF

90.4 KB Created: 2021-09-20 16:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35874c11bb2cf3a4bc21e2cff179ce0d SHA-1: 033f6df62b029b00a17aa385060379d43d64fa7c SHA-256: a6d28de6eebc8bf9ac7b202d925e7f6134e0dbd4195f631cce771c7c90244226
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The primary lure appears to be related to 'dream league soccer 2021 mod apk', directing users to a series of redirectors and ultimately to a PDF file hosted on a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80aab8aioy.xn--p1ai/userfiles/file/duseposalutogabugogo.pdf In PDF document text
    • http://autoscuolapezzano.it/userfiles/files/xetevapezorukujo.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xupojolirumugorosunijidi.pdfIn PDF document text
    • http://hkwwta.org/userfiles/5841723266.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/3920086416.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/dotilatudoret.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614235501f1be---lizufidomezoforaxesu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/78423561278.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b0b00448---16153499232.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/64718988889.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108311750466611.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/39183852434.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202196214444172.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/13999729758.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/86914521413.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/pexajegojalamefi.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/dugemekeriximomawapixisu.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kozefowikiradixewafuze.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/xasowubotumegikenaraw.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/robixeduradebidim.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210912_141552.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/fojejozudidimopul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dream+league+soccer+2021+mod+apkPDF 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_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 11048 bytes
SHA-256: b398439fd1ecd1919382116d82edf6bf095d15a2ecf5c0a36ee0101175256de0
font_01_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 19636 bytes
SHA-256: 934137e9ad3e45dce224bd0d158378b989cd013380d057de96d08f2c5c77b4c3
font_02_sfnt_off000143e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1