Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f14f7ac2e77800…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 20:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00021a90d8ea4c622c09cd18fee5a3ab SHA-1: 9d7743f423704dac860d506222f0d2a26eb7bf24 SHA-256: c8f14f7ac2e7780049fca6a2d91620035357cbbe680805a4c5c49bbd42b940c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It employs an image-only lure, a common phishing tactic, to trick users into clicking a link. The embedded JavaScript and numerous external URIs suggest an attempt to redirect users to malicious sites, likely for further exploitation or credential theft. The document's structure and content align with typical phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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 68 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.
  • 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 https://chcial.ru/uplcv?utm_term=bill+nye+phases+of+matter+quiz+answers PDF link annotation
    • http://benetalent.com/upload/files/kikegatoxajanulutit.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/bijafinibewuxokegi.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xenaju.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021092600361973499.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/tadutewijedelapojepi.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/kinukitesimibigexesalu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/43974056093.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/17221771165.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/90886171829.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/velanezenolegaxodala.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/57939205665.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c65825694---44550174430.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/taleworuk.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/daziludivutawojagajimag.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/28090046261.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/kofoweviwodiboveb.pdfIn PDF document text
    • https://successalpha.team/upload/files/ligum.pdfIn PDF document text
    • http://terminsk.by/pics/files/97321837984.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/31533592846.pdfIn PDF document text
    • https://thepainter.asia/upload/files/wifizumifadiwumefupite.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/wumogujozo.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/fekitijexivoxoru.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9090981617.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/busajodagazukup.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_off0000adb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB1 14088 bytes
SHA-256: 3d939453cd3989092fb040511aef3c6b304c9792071c91c507dcd65d96f9e03c
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 11180 bytes
SHA-256: d245a28e66ae19e089588624fecdd457702077d10fce1b3aac901c5e3f862597