Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbb3b1cf2a0211a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 18:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92d3b26dfbae2391511af52884a2dc42 SHA-1: 9594c8db232d6b08011848b12065636f6c1bfb44 SHA-256: 1cbb3b1cf2a0211a8f8beead679991c723c96b20c278fd118d926c110c3bc3c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sevoir.hu/uploads/file/80292162527.pdf In PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/xosemamululefukade.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/mijuridigovali.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/figatumot.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b864c537c---zilomizujiwiwepizijopa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a9d545219623c86ea20435a7f51e4d70/74279226599.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/gusakas.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xulusogora.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/pegogulibenobanixufox.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/4985037945.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/17858923964.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210909082115_vxfk5l.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozuj.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/bixilopifep.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/jawotinabopage.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/kizidejulaxudoneb.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/91964184480.pdfIn PDF document text
    • http://arsvet.ru/img/upload/depowu.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/33091906580.pdfIn PDF document text
    • http://afro-safari.com/upload/files/narowenatemafi.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/63519004435.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=spider+man+apk+gamePDF 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_off0000b670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 16548 bytes
SHA-256: 5927c2295a330b4c0b590145168ed7b50b761a4ce24b0ac9ebcbd74543bc338d
font_01_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 10468 bytes
SHA-256: 13ea73e59282b3157035dd840a0ae0f4790d91537fe955c0e6e5aa312c9aa596

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