Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d23fdf1c619ed8f…

MALICIOUS

PDF

74.4 KB Created: 2021-02-21 12:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 00a9c794091f251dfc526bf571cbc6a0 SHA-1: b7f1991ee9e28f05dd77b7d6ba3e3e6773554c9e SHA-256: 4d23fdf1c619ed8fec71f9f84e73d305f326a923918a71f66484065d08b8b378
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of links, many pointing to disposable hosting, designed to create a link farm. One prominent link directs users to a known malicious redirector infrastructure, likely to host phishing or malware delivery pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=mathematics+vision+project+math+3+module+6+answer+key In PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/wotarod.pdfIn PDF document text
    • http://islta.fun/fixeliguxilobezasx43lu.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/hdeggik/one_page_a_day_calendar_2020.pdfIn PDF document text
    • http://xujosigij.iblogger.org/21327734304.pdfIn PDF document text
    • http://ejqy.com/server_maintenance_reportdzxxu.pdfIn PDF document text
    • https://gubaxuxozixiviw.weebly.com/uploads/1/3/1/3/131383744/f6379b2a3c2e1.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/nivevoda.pdfIn PDF document text
    • https://woxufojobufuv.weebly.com/uploads/1/3/0/7/130739326/vewetoruvofoger.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/vijokadejeneg-fapasatopaja.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/c54fc181ca910.pdfIn PDF document text
    • https://cdn.sqhk.co/zalogifewoje/jbGlmxy/iihf_rankings_2008.pdfIn PDF document text
    • https://nomibazet.weebly.com/uploads/1/3/1/4/131437462/befojuwobome_lajufate_lozirukebuli.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://kesufelitam.rf.gd/format_calculated_field_in_power_bi.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/moboxoloxi.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/6518150286.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/du_sol_datesheet_2019_bcom_hons.pdfIn PDF document text
    • http://mupisogedosido.epizy.com/xojamabusadubinumixaxavo.pdfIn PDF document text
    • http://watawazorino.rf.gd/form_c_registration_of_firm.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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5912 bytes
SHA-256: ef89fc08117087be97b04f34e3b1289cd2233d6b7c49d38f4ce712769518a5f4
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 10312 bytes
SHA-256: 923c0017c5b528c3e5c0ccd44f4d043e8e14c33660807532c3001df524ddc275
font_02_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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