Malicious PDF — malware analysis report

Static analysis result for SHA-256 5511da8875a94d69…

MALICIOUS

PDF

67.6 KB Created: 2021-10-04 01:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 01b1609563ff8c9a42c725f167934c0d SHA-1: 8cf64f10361371e646f3a6cec8f328bf18f2dc05 SHA-256: 5511da8875a94d69b436b879ae33ea26ab3f5dcc22babe246dc8ec3ade67213a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-based design and a click-outward action, as indicated by the PDF_IMAGE_LURE heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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 https://indiachristian.org/uploads/files/revelelevupanevag.pdf In PDF document text
    • http://elsped.hu/files/file/getovejazopovep.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155fb3a35cf9---pawakurukekux.pdfIn PDF document text
    • http://mfahk.com/upload/files/48178552728.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/sanivuxawasotamogorukux.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/18016810047.pdfIn PDF document text
    • http://fullprotec.com/ckfinder/userfiles/files/bagaj.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/64247272193.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/zugapiveruvesadedafunofe.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///venapelawesob.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/43429452994.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/wevut.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/28492536520.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/kudifudalamulaxumusari.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/jerijegokujewabo.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bupedirozizik.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/46649251176.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/79763065394.pdfIn PDF document text
    • https://termoformat.md/img/files/23774678008.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/radogulodidenuje.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615952c2c82c4---82863676770.pdfIn PDF document text
    • http://parateam.cz/file/kusasukatax.pdfIn PDF document text
    • http://dbhs.wvusd.k12.ca/line/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=potassium+bromide+cation+and+anionPDF 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_off0000ab29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB29 14260 bytes
SHA-256: e6989d5edf7d4be8e30c3d0961379ecc5544f80edc57b7a45d91b2dd55dab7fc
font_01_sfnt_off0000ceaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAA 10728 bytes
SHA-256: 38bc74bf829d2c3392173c5dc5e741dec19e7536eef59eedc165131a1e214510
font_02_sfnt_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1