Malicious PDF — malware analysis report

Static analysis result for SHA-256 d536f2e658d62ffa…

MALICIOUS

PDF

87.9 KB Created: 2021-09-19 17:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a81fe2d83ebeb38b85479967da2bdbf6 SHA-1: 1317ac60e1da69981517d6632189b42501b99808 SHA-256: d536f2e658d62ffa5ea793ca6c5b937229ac3b93c519a399f06db419a5a4f3e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect the user to malicious content.

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://xn--pssa17sw71b.tw/upimages/files/xunajetu.pdf In PDF document text
    • http://brava-ekb.ru/userfiles/file/87738747026.pdfIn PDF document text
    • http://yuha.be/_files/file/gujifamamanurokigorajenu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/jonitawimazew.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109092032174200.pdfIn PDF document text
    • https://rubfila.in/files/file/38031240747.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/46657934284.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kobezevosewakitelisutogej.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ed31b489a980bb3d3c422286444f5446/20304284698.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rabovoderogi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/vaviweminekajo.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/logexenonogasezupom.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/nutaledu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/mobisiwibokutirosek.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2db042162b8f7ad7cfeb235438cab533/62030302081.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/jitimiz.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/48947752082.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/fuxikikodoluwudewaru.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/38057510996.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/52447409336.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48855508917.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/72162174363.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/81521215655.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/vubebiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+advantage+and+disadvantagePDF 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_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 17200 bytes
SHA-256: 004b7c7376c448b0914254b66b4577c2614ffccfdee5b97a46076d648bcf5997
font_01_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 10424 bytes
SHA-256: 9fa75792ff8bd2a8f33307df936719f2dd7e6897495a4409f4956c45736ab0f0