Malicious PDF — malware analysis report

Static analysis result for SHA-256 6656d4b11be0aaa9…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 22:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 852a4b3326885f6456f85ddf4678d5e0 SHA-1: 1ea3eebc266053ecd2049369dd4382bc77c67191 SHA-256: 6656d4b11be0aaa992743e0202d98a2b71628c0cc757bd23a2aca3a7ff3dc3ea
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URLs pointing to known malicious redirector infrastructure, such as 'https://crophysi.ru/wb?keyword=finance%20formulas%20net%20present%20value', which likely serves as a lure for phishing or malware delivery. The document's structure and embedded links suggest it is part of a link farm designed to distribute malicious content.

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
  • 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://crophysi.ru/wb?keyword=finance%20formulas%20net%20present%20value In PDF document text
    • http://cpskras.website/65062512862i665y.pdfIn PDF document text
    • http://erogan-oficial.site/popigimyg9.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/what_is_ls_full_name.pdfIn PDF document text
    • http://biotringel.shop/assignment_of_benefits_form_for_medical_officevzzlv.pdfIn PDF document text
    • http://viwizuzul.iblogger.org/microelectronic_circuits_6th_edition_solution_manual.pdfIn PDF document text
    • http://dostafood.xyz/9702507215086lsl.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/94341041675.pdfIn PDF document text
    • http://manthoughtswebsite.website/giripesawudubirupawehh4vw.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/multiplying_decimals_by_whole_numbers_worksheet.pdfIn PDF document text
    • http://upsbox.ru/lopejaj88vr.pdfIn PDF document text
    • http://sfhgfje5df.xyz/8756417924607xw4.pdfIn PDF document text
    • http://hopecommunitynaz.com/what_is_the_best_facebook_portaleqorr.pdfIn PDF document text
    • http://bestcreditcheck.info/vekamalibu88m9g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5ff8816e55add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474211/normal_5ff2a1e124ba3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxewunifas.epizy.com/8123612958.pdfIn PDF document text
    • http://maligufaribez.epizy.com/letter_of_recommendation_template.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/cuisinart_dcc-1200_coffee_maker_parts_list.pdfIn PDF document text
    • http://zetaginapuvube.rf.gd/88502448178.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/10243294235.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_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 5176 bytes
SHA-256: 3c248fdf2888bf2c3586a23d84a8d08096daedba2149c8e2b71e91dd2ae56f41
font_02_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 11276 bytes
SHA-256: ba115db8d37a8e456d41f638806138c537c008328237ff0a5e91f68883923dab

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