Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78edcf58d4bf2cd…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 20:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bd33e7778900d6b6da25680311fc75b SHA-1: 4cb590142c86b23ac228dbc2da2c3676b7a96ef1 SHA-256: c78edcf58d4bf2cdb5d19c283484d33443c40737c1250aaadf5625493feaea90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://oniceh.ru/uplcv?utm_term=statistics+for+dummies+2nd+edition+pdf+free+download PDF link annotation
    • https://calprin.com/ckfinder/userfiles/files/zigafok.pdfIn PDF document text
    • http://banquat.com/userfiles/files/kifatukuwopipabukelewo.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/85683089032.pdfIn PDF document text
    • http://canadanur.com/resimler/files/6143759250.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/8792214530.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/75753171659.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/wireviserogufelirudugu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sikowuwiwepolarizabulub.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6640981594.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/53225909442.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904173714585342.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/mizeradof.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/punamuneti.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/77835555047.pdfIn PDF document text
    • http://jawarakreasi.com/file/zozojaferovumabenubigegas.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/lemejijimefebudexarozi.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/zinezajuzud.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902212240.pdfIn PDF document text
    • https://timminsrenovations.ca/file/gOL7QMBMGCTdwgWz.pdfIn PDF document text
    • https://activepymes.com/pub/file/11618334131.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134010492a14---25031970104.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/jogurineka.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_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 16184 bytes
SHA-256: fa414d431296c9a164013159e373d88eb38dddd661b8b36802e7201a928da00c
font_02_sfnt_off0000feb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB8 11164 bytes
SHA-256: ebe89359f11566d1453a25ce769b079247e41963f989d4bd5ce2c88d7c958479