Malicious PDF — malware analysis report

Static analysis result for SHA-256 543344ee5fffd93f…

MALICIOUS

PDF

80.4 KB Created: 2021-02-05 22:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e06d2aeab5e69777ef305cce6401458a SHA-1: 5e123a3d7c9ddfb0501db2335e9328074d173f82 SHA-256: 543344ee5fffd93f822953b1788463d38e7cbfe10f2950908dc449b9b5357941
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Lewis and Clark worksheets 8th grade', likely to entice users to click the malicious link. The ML classifier and ClamAV detection further support the malicious nature of this file.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=lewis+and+clark+worksheets+8th+grade In PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/boradilap_pasaj_kutuwunu.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/a5ba8edc32398d1.pdfIn PDF document text
    • http://hookup153.site/gufusoxeka7vf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_5fde8b5798137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fea2eb03130a.pdfIn PDF document text
    • http://megoribituvu.iblogger.org/material_status_report_table.pdfIn PDF document text
    • https://zutuvolesem.weebly.com/uploads/1/3/0/7/130775525/nobunudijatupejovoj.pdfIn PDF document text
    • http://znasila.ru/the_walking_dead_october_1jn32p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fce5884c6f59.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/fitugafoposaboxafi.pdfIn PDF document text
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/wubelelita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471692/normal_6001191c80890.pdfIn PDF document text
    • https://wididalinur.weebly.com/uploads/1/3/3/9/133986726/wovolo.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/miledu/lipifu.pdfIn PDF document text
    • http://boligasenupe.rf.gd/causes_of_conduct_disorder.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/fonepaw_video_converter_ultimate_free.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/amd_ryzen_1700x_overclock_guide.pdfIn PDF document text
    • http://kutijizon.epizy.com/algebra_factoring_practice_worksheet.pdfIn PDF document text
    • http://fugovolit.rf.gd/14880489950.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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 5280 bytes
SHA-256: 799fa3119bfc0c61c36186dba5684b041e9a2632bf88dc8ae47a1094b639237a
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10868 bytes
SHA-256: 3486bc4fd987be93c58eee88a68ebaacc2ef963e0af4c806d4b73bf8093ad071
font_02_sfnt_off000125bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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