Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09f9279a808185c…

MALICIOUS

PDF

76.7 KB Created: 2021-05-21 08:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b8e326ae09dc934842b9df4503b9bf73 SHA-1: 739724fdc0692ee6b545e8f5a214cceca63f6b24 SHA-256: f09f9279a808185c941f457fdb680492af50ae55b4447652f4ab6e1448ef0697
164 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ML classifiers and ClamAV, contains a large number of external links, many of which are benign, but one points to a suspicious URL. The document body, though heavily obfuscated, suggests a lure related to an assessment template. The presence of numerous external links, including one to a potentially malicious domain, indicates an attempt to redirect the user to download further content or visit a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=competency-based+assessment+template PDF link annotation
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/4233950.pdfIn PDF document text
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/fa8fd73df3.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/0f3cdfa7d5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vebenok/lasudijopakipufisu.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/bhakta_markandeya_kannada_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25c6096-47f8-4897-abc0-04bc4ff27071/gudulovosapusalasitiwemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd823e72-10fd-4e2f-9fd1-adea86d2c747/jateboxutisonupepiloju.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/liverpool_vs_ac_milan_2005_highlights.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/rutapapogi.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/80395394546.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/sewofuzexova.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/14372678233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa5ca48-0b40-4b07-a407-b1e36fbb4a97/kotesiridagup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fb2c6d-0136-48f3-9cdb-00af00b848ed/what_to_do_when_someone_snitches_on_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d852450-a93c-4cb2-b288-82dad5cae997/what_age_is_the_fault_in_our_stars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/479c3bd5-73df-436d-818e-337a985a7759/data_structures_and_algorithms_in_java_solution_manual_goodrich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8c6423-9eff-4517-ac1e-9875279d42fe/sezaro.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/beckman_coulter_access_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4128f0-0486-477a-bca2-e33b583639a8/97183037269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f844b252-ec4a-42b0-98ff-0907dd78dbc6/sedadipi.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/learn_python_3.9.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 5300 bytes
SHA-256: 47e08d155659d220397c10c2e8cc6eea7885fd20412f7a757b365f5937a2dc0c
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 10728 bytes
SHA-256: b54a6184069250882b848071bd780f70535f1016ec4f9886d4fb50da1731b3a1

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