Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a80abd7d0e2a539…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 10:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 39aa3471734bdd9b9a7b2cee735465a1 SHA-1: 49fa54fcf97cfa47b108b8c0f831b420dc1d668f SHA-256: 6a80abd7d0e2a539f36193e08884a94e6ca4952a033768bc889841f7d139dd38
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://crophysi.ru/strik?utm_term=ch4+%252B+2o2+co2+%252B+2h2o+bond+energy'. This, combined with ML classification and ClamAV detection, strongly suggests malicious intent. The document body is heavily obfuscated, but the presence of embedded URLs points towards a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=ch4+%252B+2o2+co2+%252B+2h2o+bond+energy In PDF document text
    • http://construt.site/short_stories_for_kids_in_hindivpzy0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fc59ca2069ab.pdfIn PDF document text
    • http://vadudidubiv.iblogger.org/sql_injection_cheat_sheet_login.pdfIn PDF document text
    • http://axecheat9.xyz/canon_eos_t5_manuald3wac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6041968b5e286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_5ff485fbea829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493195/normal_6015db2418ae7.pdfIn PDF document text
    • http://vifofumimugeke.22web.org/pover.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466153/normal_6000033130355.pdfIn PDF document text
    • http://tryporte.xyz/scunci_steam_cleaner_ss10000h60u.pdfIn PDF document text
    • http://eurozone.pro/munekoxuviluje6eawr.pdfIn PDF document text
    • http://samozanyat.info/sepuzexomanogeni6u9p9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/bruegger_s_bagels_nutrition_information.pdfIn PDF document text
    • http://wuzazuj.rf.gd/best_games_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/padoronawidino.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/how_to_get_whirlpool_cabrio_washer_error_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/chronology_template_legal.pdfIn PDF document text
    • http://kanusilos.epizy.com/cinema_4d_template_pack_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/22436960213.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/50637496134.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 5148 bytes
SHA-256: b570ac76278cc7fdc1b716f3a2310ab484fde09e36bc6a07507626c14462e2ae
font_01_sfnt_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 10884 bytes
SHA-256: 10740a2438bc83963aa1eaff48d2158b19b9e59a5ae1c9820490871c47710167
font_02_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16080 bytes
SHA-256: a1bdc24ec6dc0332449754d26803ee00bb6717469f64a18f47c680e22104396b

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