Malicious PDF — malware analysis report

Static analysis result for SHA-256 78156d1081d7635f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 18:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 544ea8b9bfac2cdec841a560f34cf536 SHA-1: 9be552653d6a916893ac0ca025fd0f114910012c SHA-256: 78156d1081d7635f1867d3ab12c7da569a3169825b87c9cfa56944a83d0c78b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing. The embedded JavaScript is a common method for executing malicious code or redirecting users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://medvor.ru/uplcv?utm_term=paatal+lok+watch+online+free+tamilrockers PDF link annotation
    • http://tokstar.com/_UploadFile/Images/file/77192655531.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/zidunufagenaxidufarane.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zixewido.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/gaputasavetitamoxopuk.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/solunupawotukovunatola.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/efc21b8bb16c2eae73b2365c650482be/vapenekejozalusitebem.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/78588578521.pdfIn PDF document text
    • http://labsshop.com/d/files/9716232399.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_66018E2605FB2F1D.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pajuvasedivilinebovoje.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/31070741912.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/20569369316.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/jijaxunibetimisur.pdfIn PDF document text
    • http://olympusflights.com/files/files/jupuxupetewovavidunekop.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/14/71575338267.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091306220173499.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8554b8ed---bezovavejoregikajodeli.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/29204043961.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/58413644778.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/1843437357.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/81238631873.pdfIn PDF document text
    • http://centronegozi.com/public/werazowebil.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dekulojurerofakarugixajoj.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/levexusazop.pdfIn PDF document text
    • http://www.moyekolodin.com/files/33199947384.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/30237607876.pdfIn PDF document text
    • 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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 18004 bytes
SHA-256: 11d413ea5c45ae10db61ae8ea3bc4edc455fd1b8f255135104313acda8af98f9
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 10780 bytes
SHA-256: 3760617f066c476247f2aa0376c7ea332abc3732e3c4c98aca55206336b96bb8
font_02_sfnt_off000124ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1