Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d50bca7ab10a88…

MALICIOUS

PDF

82.5 KB Created: 2021-09-10 22:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 58821e3f366f49ffcdabff705a100606 SHA-1: 986d1d456f2234dd4680a6ba4333f392daf7c6ca SHA-256: 77d50bca7ab10a887763e2fb57df6be23945b26d826fa008216f8d7b84e7b404
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm hosted on disposable domains, suggests an attempt to redirect users to malicious content or phishing sites. The heuristic 'SE_URGENCY_LURE' further supports a phishing pretext, though the specific content is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=how+to+connect+android+to+pc+windows+10 PDF link annotation
    • http://vanharteyoga.nl/uploads/files/satagamakagoxo.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/94268131251.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb7865413---xokewujopulo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/76289254458.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/dezudubiw.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/47535967215.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/49793438657.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/59756514086.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/36265173656.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/15d4b93626ae2c297b6e50c8cd82f103/2836282336.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/80294273012.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/jexikexe.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/69202348576.pdfIn PDF document text
    • http://selidbe-beograd.info/files/95509614515.pdfIn PDF document text
    • https://limsurdua.com/contents/files/mevivesopadorumobegogadik.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/palusogewuwubekefugodi.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/99023676624.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/pilukujuzozofo.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/laparexaza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jilokejitarasedagezivepi.pdfIn PDF document text
    • http://erictex.com/ufiles/files/89000881197.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/22684582160.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/29667016974.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/mizuj.pdfIn PDF document text
    • http://kustari.net/userfiles/file/kafusi.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_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 10712 bytes
SHA-256: 2b570b1f3d09859c50a124984a80bca8d191ff5d0c8693bbbbf4195fa5cb5ec0
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 18764 bytes
SHA-256: 099372baa2107dea2db7f43eac950aeb4666fe787f9d72b69d3de5dea069312c
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1