Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c7323b89d1c8bd…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c23cee18a9bce4e9f895a3c8bb2e9fe SHA-1: 2178bdbf1913f19feb4049b2470bfa072348d49a SHA-256: 98c7323b89d1c8bdadc538983ccafb4df11cbe97af798005bacfba50766ba36d
134 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristics indicating its nature. It contains embedded JavaScript which is known to be used for malicious redirection. The numerous external URLs, many hosted on disposable domains, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+create+a+boot+animation+for+android PDF link annotation
    • https://santechnikosdarbai.lt/images/files/82137837694.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/pikijilegegol.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/4920611772.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tolejuwolugixarigu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/56073056492.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/nazuwojijadenesirok.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/ragejaxogenogadazomaxobab.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/52272742131.pdfIn PDF document text
    • https://hssanesteban.cl/files/58975827070.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/l4rh5ogobore5f5okrmg1l8b6c/69609166371.pdfIn PDF document text
    • https://loyd.rs/images/file/86604295162.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/zubujebami.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/durubudaribisopaxupakigow.pdfIn PDF document text
    • http://storemisr.com/uploads/files/wafufe.pdfIn PDF document text
    • http://baove24h.org/upload/files/93810620353.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/48053419655.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b2f374f5---68746167037.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tabitagunut.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/19007947603.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tubemogazosuv.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/29180667619.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/33931710668.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/vekiwog.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_off0000cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 10640 bytes
SHA-256: fc5fb500a3eaca0db5e618932f4e4a0a7d412fe706992dad8b341d4e854e39af
font_02_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 17136 bytes
SHA-256: 02c9fe0b395abf5c9b53949a61bee6797745a4f82e036239ce3fffd440f198d9