Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd98dde62230d2b4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 10:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: be81188c925f5607905e012c1314248b SHA-1: c95f3512b97c5a854eecd07bcfbb139fb08dce73 SHA-256: dd98dde62230d2b4d99984301cbe3ff02730f55c625da376989bd60f5c425428
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to external websites, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=app+transfer+photos+from+android+to+iphone PDF link annotation
    • http://auburn-companies.com/userfiles/files/32452968715.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/43721996315.pdfIn PDF document text
    • http://3asoft.vn/img/files/bedij.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011836325535.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/95813782889.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/soxowefobapasosa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdc83d79---24139746631.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/jatebisivumagefabegon.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/749495194612ecba6d5d73.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qa2401jfs0v6eorfl07uc0ei93/bolamumobaduwilusasijifok.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/8017367138.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/topawofabevagituwitonisaf.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_211648.pdfPDF link annotation
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/32660346238.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/tafenexafibofepiwod.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/teriwizuzidilibob.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/74080884161.pdfIn PDF document text
    • http://bakoca.hu/files/file/madezuvefopidibenet.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/bekutoxibapusoloronov.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zixaluwegisapumokixizuwas.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xevafikeledezal.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/6845394300.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/78210568211.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/wudawomu.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 10700 bytes
SHA-256: 7244f24d51da4c3ee602aa015969e7a97703e6c10f0fe537b67313b04a4312a4
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18416 bytes
SHA-256: 9a9fd936bc8f8b63f04d20a484039ab7b21cf4f99e9e3c0460ee82114feab82e
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1