Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba8a2009c31691e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 09:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7e0f04773a224aacc132b847d4973f7 SHA-1: 8595d5b85211397386cb477e0eb13f15478c87d8 SHA-256: 8ba8a2009c31691e856b1e8a60c7501c57e1aa41432da7256cc073ee2c5caf42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://carbonelite.ru/file/2692774206.pdf In PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kagoxaguvometuzoka.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/96922326516.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mixajekafojunez.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/29742195734.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/31a6759439bc009444523c5ca596d893/6432558580.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/zapebodiwuwebotulemepo.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/sokavubofaman.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/penefof.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76450176581.pdfIn PDF document text
    • http://axwelindia.com/uploads/gagageveziwajisize.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gapipozedapopegilalexuga.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/zinebofezopadumere.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24500763847.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/torod.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/pepowatonofijegubejelo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/rejunigipisojugafib.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/xelimajuluzasolekerime.pdfIn PDF document text
    • https://blokhol.com/upload/files/95625512315.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/lizuwipevan.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/sufex.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/faxefipazu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/98734696270.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/56527069137.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/41614949730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+undead+slayer+1+mod+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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 10808 bytes
SHA-256: 09d1ba64621b774c09f11c517119466ab7911a3404b8975a781d3384dc95faf0
font_02_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 17396 bytes
SHA-256: d94ec2a5a0ee6d7b9deb23685a63d69363018a6156680d44a8ef149c9c4f5dba