Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d53658df8da9096…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 00:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d613a1f36c48315181fbd8d8da04afc SHA-1: 007a354adb5ba147454f28cc4e37f08db515f3f6 SHA-256: 0d53658df8da9096d620109f6761617817d34a6aba0fe0ad9ea54bdd22c0e465
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The PDF contains numerous external links, many pointing to disposable domains, suggesting it's part of a link farm designed to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into initiating contact, likely for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=asus+supernote+apk PDF link annotation
    • http://shopabrang.com/images/files/49457184067.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/25794688668.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/24846859903.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/21661525783.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613493fd386cc---9029650164.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/75101074952.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/3090048559.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/69372299381.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zuvav.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/37118883323.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/lisixusejawosexexaxakebil.pdfIn PDF document text
    • http://446888.top/userfiles/file/13658689748.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/lofuxefo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/32353309787.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/xaxibudezami.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kogozuxagu.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/wogijigezonozo.pdfIn PDF document text
    • https://samowar.ch/upload/file/tubas.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/vepezalo.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109040639329766.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/nokarusisenade.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/59752804855.pdfIn PDF document text
    • 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_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 10280 bytes
SHA-256: 8d43508774e010230724ceb9f7e7d341122ec630287055a16963e28534e2183d
font_01_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 22984 bytes
SHA-256: 146aefb5bc0438e9f8ad94eff81d09f4cbb5eca0c8afc527d485cc46d869e42f
font_02_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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