Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c1a051ecf9d493…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 18:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88ee02ab9e03fae994ac383418ac4c97 SHA-1: 1cb19c3363e8d2785c8e5bf49d8ce91547594f3f SHA-256: f2c1a051ecf9d4935c8598c403fde88bcbb2a553a004b5b8d6ebc1b6b0db17a2
174 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/29040956973.pdf In PDF document text
    • https://tenfci.org/userfiles/file/davarizoki.pdfIn PDF document text
    • https://eklyps.net/images/file/ziwogajol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/resopoxopifebiw.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/pusofojowuvazelaf.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/kibazegabanasog.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/56590393016.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/92300793994.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/70040887968.pdfIn PDF document text
    • https://edgecs.com/documents/rutaju.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lumebemajaxovanupu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161477663b7946---vutikepoxoporaluluzuxuj.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/83741450127.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1a010905---73619062105.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/29924148513.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/42823143522.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/2063960665.pdfIn PDF document text
    • https://producto.works/userfiles/file/gaxofuniwobemexeramijoko.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/25831012751.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/gunefen.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/62799114617.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/rasisujijufog.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/41766541295.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/17175269954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+patch+apkPDF 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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 17100 bytes
SHA-256: 68e5f24adf089014eae21d389aae01658608a762642c15c4ead5274d5be01411
font_02_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 9996 bytes
SHA-256: 259ddce351b882e578910240816ecb77d777dd71d679e361369b734212bf9fc8