Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16ca5a2fff4b45c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12efa73ae93d4c184698a812edce60a5 SHA-1: c0eb797e228337023271bded6712d98c1cab040a SHA-256: f16ca5a2fff4b45c46be710fee8d53f555835b33fb96e14fc64d929d6024cc35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://cructi.ru/uplcv?utm_term=how+do+i+make+a+group+facetime+call PDF link annotation
    • http://caffepontoni.com/uploads/file/luxegifazojifegifotora.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/wupazanesi.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gonifotamitodipi.pdfIn PDF document text
    • http://specialcats.nl/media/files/lutuwuwuxovaduwij.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/pijadarija.pdfIn PDF document text
    • http://www.77ice.com/upload/files/70971384933.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f203d4706---58624196279.pdfIn PDF document text
    • http://asvpp.fr/pdf/56450139228.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/4679981316.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/wagimawonu.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/sovupevipabiraguwobef.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/modupejofuzaw.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/tujiriradaxibikobowivufi.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/zefetexezokapewudip.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/batupuwipigezatodafu.pdfIn PDF document text
    • http://riviera.az/userfiles/file/62333728398.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414eae9034---wupixipudagumewuxu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/91958141159.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/wudunob.pdfIn PDF document text
    • http://artepcb.com/upload/files/69251434238.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/somulopo.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kobodigudaxasubufekofo.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/xixuwisuvenozuzureka.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/xevenawida.pdfIn PDF document text
    • http://maidichike.com/upload/files/teganalik.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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 17564 bytes
SHA-256: 89a35ff428cacbd9cc59ca0846d38c43cc4b2d574f63c6c1f6aded116386fbd4
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10960 bytes
SHA-256: 296a632655524766845e915147e6e23f39759d49a69ccbd3620e31f6b30f260d
font_02_sfnt_off00011bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.