Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faa932780eed22d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 13:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 266eca4e600c883c17a25af97c575102 SHA-1: 2da29bfbef0b9dbc818c3ffbe706f26d313a2afa SHA-256: 8faa932780eed22d8607d4c3e9f1760cf8f5db5034a7c6719fd7097bfd0d17ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links pointing to disposable hosting, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=watch+the+meg+online+free+123movies PDF link annotation
    • https://brakos.it/file/87055755170.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/gosutuwunoreme.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/mefufuro.pdfIn PDF document text
    • https://derfo.info/resimler/files/vumoxelape.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/83441597454.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///dinumeparob.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/92620725146.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/telofiru.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1de80d08---rekuwefiroxesisaxuliver.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/24426677480.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/9038509479.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/31837221984.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/32525364021.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/81212252097.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/pumuxevaratosalabakinep.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/45799456219.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/5485214981.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mivonaw.pdfIn PDF document text
    • http://sayarbobinaj.com/file/21950994946.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139810dc5e32---54216314179.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/tejegu.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/jagupabuvuvokarozurojogu.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109151831256259.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/febexabesibozabenorul.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/2281863231.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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 11184 bytes
SHA-256: 8110141edccb6336a7511df53fec60a43a9162b7a6a065e11101f3fedb905701
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 18260 bytes
SHA-256: a55c40176f99ae0833974b4b3ab8abc3f6a194be91212ef25c046f40851ef78b