Malicious PDF — malware analysis report

Static analysis result for SHA-256 8699cdc18264bf95…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 01:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e887723d34b4e415a6294241d284ef5 SHA-1: c1a22d01d1bf3d60c6ecf3139e7de5b3f3800c22 SHA-256: 8699cdc18264bf95b4f16854b5069d978ae78e00f41b971d4f1afa9cd6373bc4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it contains numerous external links, with one specifically identified as a random URL on a disposable hosting domain. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm, likely designed to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and link distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • 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://jpt.mysmartedu.com/uploadimages/files/vulizevevuwot.pdf In PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/dolenokalakemadukiteda.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/valotimiwiburokog.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/74840268454.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/tonipulelel.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/ledemuzetaboti.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7661a01f---jidevukivegiso.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/dusowusetaxube.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/sekekupowukoxupadu.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/83436533573.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/dazurogawasitalop.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/patuvutusawadijimisum.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/14532727620.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/tuzerabopupamebu.pdfIn PDF document text
    • http://domosplast.hu/files/file/dobufebuzule.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210907120017022963rgo97k9p8gxg.pdfIn PDF document text
    • http://nprofit.hk/userfiles/99762581570.pdfIn PDF document text
    • http://medi-sen.com/files/files/58474834083.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/48509071746.pdfIn PDF document text
    • http://hbaoge.com/upload/files/22695438078.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea7fe8119---rinasedapunudux.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • https://ocw.tw/uploads/files/rolelumu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/21874374488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=file+comparison+in+notepad%2B%2BPDF 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 17424 bytes
SHA-256: b5da3b08a3009b9c9a4cac9a8edea4302aa9b0ae73a7b716c3fbd1f569c9d3ab
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 10652 bytes
SHA-256: 47dd4cf787d436abb78ed29a06ef0605f71ca1f34a6fb92fca16eec1c4bfd340