Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca445d96a44125e0…

MALICIOUS

PDF

68.6 KB Created: 2021-09-30 15:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 15ea9d4e14997c63c44c8c36eae080f6 SHA-1: a210d05fef2dca6326cb2ce90ae950db615aa724 SHA-256: ca445d96a44125e0da336a2eb6cac997bab7189a3b9a4c984af7d15e757b9b82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://tranduongauto.com/app/webroot/files/images/pages/files/85371568299.pdf In PDF document text
    • http://elistaprezentow.pl/userfiles/file/26802065280.pdfIn PDF document text
    • https://austarpharma.com/upload/files/momotibixofatono.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/53721607697.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/45240234142.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c8d8477107---xagik.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210923211617849.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/dikefitefupijetopirora.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/lijujurulevawopena.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/11334306003.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/28930565763.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/83416956185.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210911_A305125D143EEE39.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/63326861612.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/wapefuku.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/41866640266.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/93776225147.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/57k38s8mpmgdqrhk63a14fbnik/lazutupidopemagilake.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/37793146898.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090912445573499.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/51792479831.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/8921140376.pdfIn PDF document text
    • https://kuepancong.com/contents/files/tewategi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=i+love+you+like+quotesPDF 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_off0000b144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB144 14660 bytes
SHA-256: 34aefdb442cce51dd80e94f1affe1986c3d961d6963cd807815ece124687a359
font_01_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 10204 bytes
SHA-256: 77e5cc6c30fccff11368b4257e8f8fd1f09c11a81d7d5c407ad1567c4ec5a292
font_02_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1