Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4137f085537c2bb…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 02:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fff56a874157991e7c9432f30b19913 SHA-1: 1fb400f527f28edec859112fac3e48ade90d4326 SHA-256: e4137f085537c2bb467e3bd89c154967c27819990737e97482110978782f27ee
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs an image-only lure, presenting a screenshot to deceive users into interaction. It contains embedded JavaScript and numerous links to external sites, many of which are algorithmically generated and hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 1 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://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/68651398843.pdf In PDF document text
    • http://finalstage.biz/js/upload/files/41414336808.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/22175225065.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/xitemuvilodijugadotu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/42168433476.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/16189448434.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/65376176234.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/37302087750.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/14815534567.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dumefirujumupakija.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/46006592984.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/bonumigilixofoluju.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/1015039115.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/fujesoxozafiril.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/56412424696.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gopivavemu.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/96011994168.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/nujazux.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/jebuxonufilusomujujagijo.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/tuvovaka.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/lanolapidodamalig.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/dupule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+realistic+apkPDF 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_off0000b1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AF 14376 bytes
SHA-256: 5b2c8b899d38391598b82ad0ab0efe82ebde7af997752934001e4d050a466e7c
font_01_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 10436 bytes
SHA-256: 320b9cee280c855946ff017f03291a5464b122995457aa1d902ca873a375cd66
font_02_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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