Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73fceeab458207b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 20:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15a9ba99e0b5dcbcc2dcc32803dcb684 SHA-1: 1da0253993ddf00a9edfe9964942b2738694db52 SHA-256: c73fceeab458207b284f85a79440f9987207f842384db45c261da71a2b7807d2
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which appear to be disposable or low-reputation hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm, a common tactic for distributing malicious content or conducting phishing. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://philabc.ru/uplcv?utm_term=roms+de+gba+para+android+en+espa%C3%B1ol PDF link annotation
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/titoginubud.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/pevebamenabed.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071825462870.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/233104751.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/34118203840.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/pawujuno.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/buvasig.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/xenenetafasu.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/38590980080.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/figejupumexetibe.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905172001416918rw3ojtnrggvm.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161374028586ed---jewow.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa592f6a6---remofopuramibodupu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zapaselesexax.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/72070193773.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/bamimixajebejakizafiko.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/33292356375.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/37083579835.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dobuweva.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109032155358245.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/85278259571.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/82915035399.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 19588 bytes
SHA-256: c15c6fbab48c4d4dab73cb0c65a02e5bb68a1672ffc6c9b7ea71502f5490c22c
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 11028 bytes
SHA-256: b9bc528a9a7311da1fe0f3a2e913361c9e58b013d27118c28dab428330984c56

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