Malicious PDF — malware analysis report

Static analysis result for SHA-256 8513e208273bafb7…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 19:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3d9ee986e12e9099d1096f8c7c4c962 SHA-1: 07241bf5b4e9bd10a7215c0763e2ad6712582510 SHA-256: 8513e208273bafb75347154714c71a4e1a97947c9564627266dd460c8ac085c1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable action. It contains multiple links to algorithmically generated URLs hosted on disposable domains, indicating a phishing campaign. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • 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 67 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 http://aleshashop.net/uploaded_files/userfiles/files/vibinutitipowifupivim.pdf In PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/271008405772.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/60272950407.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/66887948696.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/68639345924.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3968ad90040e9d5bcd3f24fad71ffa5/suvadiwuzutijabupe.pdfIn PDF document text
    • http://dezis.ru/uploads/files/tozolobuz.pdfIn PDF document text
    • https://trystsalonri.com/images/file/wenamodigutibapo.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/77012380036.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109022243003107.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rozixotitaxu.pdfIn PDF document text
    • http://kezheng.net/Upload/file/vivavotodugosajapux.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/80668115029.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/7747773627.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/89045022536.pdfIn PDF document text
    • http://dsagco.com/Upload/file/11392343621.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4784723a---gojabegu.pdfIn PDF document text
    • http://air-con.ru/upload/files/gamekoxu.pdfIn PDF document text
    • http://cpils.com/userfiles/file/71582870212.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tajagemuzozozasalin.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/dukibagezakemivubifera.pdfIn PDF document text
    • https://kokomanis.com/contents/files/53208121758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=list+of+animals+affected+by+deforestationPDF 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_off0000acd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 10848 bytes
SHA-256: 4048cffb280188b593d6f0493dd031e95f7198a126a7991be2ed2f9c801cecfb
font_02_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 14220 bytes
SHA-256: 1fef364ba44eea989da92f42b6174bb77d1a6ed3a1ca0f4c986cce538334f98f