Malicious PDF — malware analysis report

Static analysis result for SHA-256 891454410d08d06d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 06:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 810f8050fa85572c6706d1304d770bcf SHA-1: 88bebb948e50acd257710129c9e611f8a4459d9b SHA-256: 891454410d08d06d8bfb2d682f9790a30f4263173e7baad65a03a2608a30be32
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple high-severity heuristics, including ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external sites, with at least one pointing to an IP address and hosting a PDF file, suggesting a downloader or dropper mechanism. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://artistprasanna.com/userfiles/file/puwobudunalirexugalapu.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/pobusexozepivu.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/86597940160.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/41737546756.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef58d3960b---31837572335.pdfPDF link annotation
    • http://taociren.com/upload/file/210911020343773501j6gor8ua9onc.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/3655521910.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/21975352039.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vaxirawanizuxojafalefizug.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/81148927280.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/74503325790.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zexarigudunapamusi.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/tojufamabomarubejas.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/tasomuv.pdfIn PDF document text
    • https://led7.ru/file/nifitanudifuf.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/23288285467.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/75698822359.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/36301483363.pdfIn PDF document text
    • http://cityfate.com/files/files/72548115647.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/majolizijemolokupufariz.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/lilusemofewezedegapoda.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7d23507c957ee00d5de7883db79a5477/ketasulupirujuzavawabuzi.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/pusevijilad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rome+total+war+create+unitPDF 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_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10452 bytes
SHA-256: a0a7479c2be2c08b4fdd81878dbaed397620fc25944ef3828e8ed7feb99f4ee6
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 19180 bytes
SHA-256: d6d1bbde9727df42b4d4f98877e56e4724e41a0016cbe9c766c3f1894e632fc2

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