Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89e32ec721ce57b…

MALICIOUS

PDF

70.6 KB Created: 2021-03-05 13:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f1b01b64406a29c52dc771bb93b9878a SHA-1: 536f2787056982288f85a32ceb731f51908a0bc7 SHA-256: a89e32ec721ce57b584fd60509eb606ea4b3dcbb99fbe2372c8841c87eb3315c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to connecting a Sandisk MP3 to Bluetooth, likely a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://resalured.ru/123?utm_term=how+to+connect+sandisk+mp3+to+bluetooth PDF link annotation
    • https://cdn.sqhk.co/jirudumom/gehij5O/turofer.pdfIn PDF document text
    • http://forsage.pw/36545013090obc18.pdfIn PDF document text
    • https://cdn.sqhk.co/wefikoke/IdvvKja/cafe_racer_vs_biker_jacket.pdfIn PDF document text
    • http://stickerrus.ru/globe_at_home_default_password_router6gnth.pdfIn PDF document text
    • http://accface.in/crime_lab_report_template5f4g0.pdfIn PDF document text
    • http://mklhhhh.space/sometemawolojukakixo923s.pdfIn PDF document text
    • http://sportplays.ru/licensees_compliance_assessment_reportrw9zv.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/FjhgFlJ/xuwaguvis.pdfIn PDF document text
    • https://zagamujibagixon.weebly.com/uploads/1/3/5/3/135326067/a0cd45460d60.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/kasobidazuxanov.pdfIn PDF document text
    • http://repetitor-ru.ru/6187161422hja9v.pdfIn PDF document text
    • http://walletelectrum.buzz/how_to_get_business_loan_from_sbid1q1h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagikesedogoru.rf.gd/8830233338.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/fafezisa.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/girawokukipugodel.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/45950148536.pdfIn PDF document text
    • http://gasigigi.rf.gd/gujux.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/curious_george_book_summary.pdfIn PDF document text
    • http://derekage.epizy.com/1894011296.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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 5640 bytes
SHA-256: f83e1564f9f4fd05a2c638558b8e1e295d3d9c30280f7d607b287016997d8097
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 11100 bytes
SHA-256: d50f5bb05253596264c089c6781bf362f0facb1aebc04f4c0db2da2be0e1f3b8

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