Malicious PDF — malware analysis report

Static analysis result for SHA-256 b929558bf5bb7a81…

MALICIOUS

PDF

77.9 KB Created: 2021-10-07 18:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: b55116853a4044426f1e1396d2bac914 SHA-1: e2cf623bcaa7113e40247689b65d1cdb716d68d8 SHA-256: b929558bf5bb7a81f11c630c985e041ed5e959822674c52359dff15e0f4dfdd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with a heuristic identifying it as a link farm hosted on disposable domains. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=interpolation+search+in+data+structure PDF link annotation
    • http://alarm.pl/userfiles/file/kulomus.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/meremipefiwavoruti.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/zexexo.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/pemufipomulewameta.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/lutusa.pdfIn PDF document text
    • https://dm288.com/slicice/file/53290755069.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/47223277003.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/kirun.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/28055072076.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/99555934412.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/nabakupiwutuzibud.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/18596192589.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/45178646001.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/43480195096.pdfIn PDF document text
    • http://inercial.es/uploads/files/totumijefedamufenokig.pdfIn PDF document text
    • http://lachina.cn/upload/file/fowapujixurip.pdfIn PDF document text
    • https://slotpt2.com/contents/files/57126503297.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/potubosemitolivibinokilu.pdfIn PDF document text
    • https://ratosatu.com/contents/files/waxisefena.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/45834215154.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/pamuwufotinizinotezivese.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zagubin.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/muzemuvawolurufagokonuro.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/53579582603.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_off0000c5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 10660 bytes
SHA-256: a328559fefa67fc899e28ca2257bf1535c1b8216dc911dab0966db3908b05acb
font_01_sfnt_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 19664 bytes
SHA-256: b184994037a94365f067dab98fa4ee3e1ec316f0aa96ef16e113d0b8849f7b83

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