Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bacd0add7fd1396…

MALICIOUS

PDF

67.5 KB Created: 2021-09-29 11:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1adf5b34f30990c6d9be4a1a9bd3d3a3 SHA-1: 97a8b5ba6c5def24e27e83b3c5e58f088e13fcc3 SHA-256: 8bacd0add7fd139607f9289195f5709ae3a44186680dd52af0f61884a321e12f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alyosserspneed.com/userfiles/files/90965473077.pdf In PDF document text
    • http://fasson.vip/images/editor/files/4775152819.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e8ef2811---xipepiza.pdfIn PDF document text
    • http://prosquash.by/data/wodezovudal.pdfIn PDF document text
    • http://tcihk.com/userfiles/34228384172.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210920_112546.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109011013591631.pdfIn PDF document text
    • https://value.ae/userfiles/file/52569819194.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/sedujikulugowovidaji.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jipuvewufejowozobowotop.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/maparoloxezaze.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jededijasaxunopalirubi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/lagexewekelalid.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/54909270624.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/1204740680.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/67114045457.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/gesanomin.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/devojokejizoki.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f4dcd6d7---podepatuvidowagosumizeda.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/zabudetoxanejebaxel.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/31768292701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lesson+11+constant+ratePDF 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_off0000aae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F3 15516 bytes
SHA-256: fc43a2759992ca06e2077fc1ef98b2ef42e806cf019ec7b5ab1a25a61bc9108a
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10096 bytes
SHA-256: c4b6696046c709e8ed10cc335a0ff4086d7cde56fec18f332dfa81fc8d0eda9a

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