Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ff09d95875bb6d…

MALICIOUS

PDF

66.6 KB Created: 2021-09-24 17:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 749615686f2e61e1888c6c0866fb33aa SHA-1: 3135fde23189788f6d74134eefd626efb034a766 SHA-256: 82ff09d95875bb6d9a0b49836ba271c5396e9b65368316f478cf11c81983d42b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide malicious links. The numerous extracted URLs, many pointing to disposable domains or link farms, further support this assessment. No scripts were extracted, but the presence of external URIs suggests the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=best+ereader+ios PDF link annotation
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161416e560d70e---nanemefewalok.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/68617888668.pdfIn PDF document text
    • https://huanghecables.com/d/files/timifevubejajojo.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/61829023400.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/rolaf.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/rilakeselorupasaxamu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/47695548240.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/fovanem.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/152353172945.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/62562310289.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/goxopunexesosujenigo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/3487033683.pdfIn PDF document text
    • https://dintek.eu/uploads/file/semebu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nokasupisanapokewekobupo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f7d48b40c---sefimazabi.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/lawuzivedozebikabojo.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/labetokuxizanibimut.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/50201171330.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/1577340672.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/36721344280.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_off0000aaf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC310 10144 bytes
SHA-256: 6527a40a44665e37ec9ba5de9f3e874ff96905c0cb45b471b46593d10d286a98
font_02_sfnt_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 14240 bytes
SHA-256: 34a934822dc22604f83461344951e22ddd3fe68484a0a080cdaaa781f159c046

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