Malicious PDF — malware analysis report

Static analysis result for SHA-256 a188f842cc6a085e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 02:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3c101df8ece959a9ea87049b6767aac9 SHA-1: f2f463facb3ab9cc40b5afabdf8fdcf19959e2a8 SHA-256: a188f842cc6a085e1b6323122cd9f84d3e705aba0ed31033708560a1c860bff8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to potentially malicious domains, suggesting an attempt to redirect users to harmful content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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.
  • 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://shiokuda2.com/contents/files/pefitumugebasigoduxam.pdf In PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/80367778552.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/warikavujalamereta.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/4163487953.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/91081537119.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/febevumefenu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zoroladosufelofobo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/xivigurun.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/risijuderaniz.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/24763255593.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908100013580442.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pemafokuma.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/tuvorebiberajir.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7d197d3---vuratulozawuzer.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/dumaxalub.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/85255917945.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58e2dd2e1---85525012850.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/85340656525.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/48242814635.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/xubunubifur.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/magizidox.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/pinebinamenej.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/salumozidarasonumunikama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=farm+story+2+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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 10340 bytes
SHA-256: eb13abebe363712642572631f3b4116577b7e8c72e1cae59c4bacf1a73072896
font_01_sfnt_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 14072 bytes
SHA-256: 9f61f317cdf4c3a1d6826199fb16545cebcbcb44d036e4e658ef5a9e67141dfa