Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1903fe1bc2921a6…

MALICIOUS

PDF

82.4 KB Created: 2021-02-16 12:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ad2fdce71a94a92032d891d68560bdc SHA-1: 4fa356de724fb86c2155fb474f4b2416c26e2e13 SHA-256: b1903fe1bc2921a65e686187ffe1399ffd61a2b897890ecd44b4ead6afdf6fa8
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains an embedded URI pointing to a search query and multiple URLs, one of which is explicitly identified as an action link for brand-impersonation credential phishing (Amazon). The document body is heavily obfuscated, but the presence of these indicators strongly suggests a phishing attack aimed at harvesting user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/7879920.pdf.
  • 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://seumenha.ru/wb?keyword=craftsman%20air%20compressor%20repair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454048/normal_5fd0bd05af7e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fefebf08532f.pdfIn PDF document text
    • http://gelivebun.22web.org/43121381323.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/fhhXhgf/venmo_account_on_hold_loop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_600dc358227bc.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/7879920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_602aff9873d96.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/fgdbhdV/veboxozuwovev.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/hidhbjj/my_nickelodeon_movies_dvd_collection.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/samopakamefap/taforiruwi.pdfIn PDF document text
    • http://gudirazopusexi.epizy.com/brussels_airport_company_sa_annual_report.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_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 4940 bytes
SHA-256: 70259db4e597cffb31d3487305d5d9710b7ddf66f66f511adc8e8aef0e21e84c
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10968 bytes
SHA-256: a175ea4f9e4f7d4be0934515b063e41d47478030744da99181e978f0338a70ca
font_02_sfnt_off00012e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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