Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1a2dba5e097f5e…

MALICIOUS

PDF

128.4 KB Created: 2021-03-03 10:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb5f9ca2a14c035ad6a7c39c7dc842eb SHA-1: b5b58b23f87494dc1f2c74bdda0ee75e44d58a58 SHA-256: da1a2dba5e097f5eb719cd6bad25c9b664d1ebe40371613c947ec58b238a4557
136 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV and an ML classifier. It contains a lure related to 'brown vs board of education' and redirects to a suspicious URL, vilenefex.ru, which is likely part of a phishing campaign. The document's structure and embedded URLs suggest an attempt to deceive users into downloading further malicious content.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/123?utm_term=what+is+the+meaning+of+brown+vs+board+of+education PDF link annotation
    • http://kekewawoxugar.sportsontheweb.net/63510278909.pdfIn PDF document text
    • http://axacheat4.xyz/5267310385952yj6.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/autotrol_1550-tc_water_softener_manual.pdfIn PDF document text
    • http://sport-stavki.fun/democratic_party_voter_guide_los_angelesuf6zb.pdfIn PDF document text
    • http://wekeb.space/34185036751vs6i9.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/daruju.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/sabewofasapixizukesijala.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
    • http://fusarafabar.epizy.com/avenged_sevenfold_waking_the_fallen_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/deragavufapajobi.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/interview_questions_for_teachers_during_covid_19.pdfIn PDF document text
    • http://gezixerigalejeb.rf.gd/dmv_written_test_questions_and_answers_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/duditita.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/tidovovinedanuwekizik.pdfIn PDF document text
    • http://wuwovedivaz.rf.gd/android_app_store_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/73393257755.pdfIn PDF document text
    • http://sexujojo.epizy.com/97739823983.pdfIn PDF document text
    • http://lidufaz.epizy.com/86830634721.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/8469217589.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_off0001ac6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC6C 5588 bytes
SHA-256: 1ee65ca57d5128a3a357d45ff4064befb8d84ea6bd50e9a4ac73b26c0f81331e
font_01_sfnt_off0001bf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF5E 11316 bytes
SHA-256: 0b250fbfa283f093df2587cab7c22fe2f2230750e60c06be5939f6d783d44898
font_02_sfnt_off0001e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5BC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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