Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb66f4b95b29ae6…

MALICIOUS

PDF

88.5 KB Created: 2021-10-21 01:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10cee23e5172155e8e6debf1009602ff SHA-1: ab4df86579bbe659fda7f17fde165ff479917549 SHA-256: fbb66f4b95b29ae6dba1eb7cc3f57abc474331d8416c5336d48aa060cb89194b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics flagging it as a link farm on disposable hosting and containing algorithmically-generated URLs. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links suggests the PDF is likely a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://turar-mussin.com/userfiles/File/filozubolavekuxulupewik.pdf In PDF document text
    • http://garantc.ru/userfiles/file/zafiduva.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/91eee70236515a6ab0becaffcc8a1e70/wafab.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/14518013539.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/19261656870.pdfIn PDF document text
    • http://nktrading.qa/file/files/ruvogisutofenipadov.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/gedodomipuveralilafisi.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/padimuwufogixadix.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/kiginadodum.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/98495810920.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/22460987649.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/rufufasojujawapamusivev.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210926_043242.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/rikag.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/22331490736.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/figodoj.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/68904472590.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/ximejemapigafapaniz.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/14913703400.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdb111ffe---zazidenu.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/91533478804.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-10-1/20211001034451599242.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/maferikowalafasisip.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/kodaw.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/39863727651.pdfIn PDF document text
    • http://sartor.ru/upload/files/tabedemojufuxosoxavola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=adding+and+subtracting+fractions+answersPDF link annotation
    • 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_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 10912 bytes
SHA-256: 8c3036a533c1de3d905880608c0686cd9b45f4e2d8d62a8462a5ab0fe8c7c5ef
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B9 18748 bytes
SHA-256: 1c336b6dbc305bab8f386f9151fa94e338a9ddc33e4ad5eec50a2d1982e4f85e