Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bef79279eedfee…

MALICIOUS

PDF

73.3 KB Created: 2021-02-08 21:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aaa7a31ef0b06efaab813741e9f06ae7 SHA-1: 5264a6558fb2478ee7ed0fa9286a1eed30c2bdbd SHA-256: b1bef79279eedfee75e7b0d5e35e964bfd9931e0c552b2364ce74e127f2969ef
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'calendar appointment apps for android', likely to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://baarspo.ru/wb?keyword=calendar%20appointment%20apps%20for%20android PDF link annotation
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/tekedepiguribaviveno.pdfIn PDF document text
    • http://fajutixosisi.22web.org/bogan_movie_background_music_free.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/5634291.pdfIn PDF document text
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/2c96e3d4.pdfIn PDF document text
    • https://numuladak.weebly.com/uploads/1/3/4/6/134613837/mevaxewuseris.pdfIn PDF document text
    • http://xowivek.iblogger.org/ta_army_admit_card.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389616/normal_60087a2241d67.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/tular_pakixeverexe_rozutumokopem.pdfIn PDF document text
    • https://vagafanuwojuxiv.weebly.com/uploads/1/3/0/7/130776749/3843500.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/true_caller_id_name_app.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/sapabebaneteg-tarajusegex.pdfIn PDF document text
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/a9476efd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_5fe0f79e2f58d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jimugivos/85821743425.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/zadalebotekujofadizegisap.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/academic_ielts_vocabulary.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/environmental_compliance_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/zazusilenegodosi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 5000 bytes
SHA-256: f558322a01e4db1f667b854a3b09420f128aee223d3d495bf34c684a89fd8c11
font_01_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10372 bytes
SHA-256: a6dfa2407f6584eaca0122a45bbf801181323b10ccee64092da3816361317667
font_02_sfnt_off0001096e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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