Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab98a21c9085b46b…

MALICIOUS

PDF

63.0 KB Created: 2021-02-12 21:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e18add7b44e483a72bd84be3278d0c42 SHA-1: 583f394590240637b2373f718db355a0e57d936f SHA-256: ab98a21c9085b46b6feb199bdb4afdef0afd78fc16414e7239efaeda7dfde4b9
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=capitulum+of+humerus+xray'. This URL is likely part of a phishing campaign designed to trick users into visiting a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL in a PDF document strongly suggests a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/123?utm_term=capitulum+of+humerus+xray In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5fe3be922ab27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5ff08176b4771.pdfIn PDF document text
    • http://benosetib.iblogger.org/28474414084.pdfIn PDF document text
    • http://kupivse.xyz/game_azur_lane_pcvlnc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484618/normal_5fe4e654aad60.pdfIn PDF document text
    • http://belplitka.ru/zolevotuwakuwesunupusevimx13m.pdfIn PDF document text
    • http://vilopeg.xyz/jatirafifotofijalavimuxjdh6.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/Vgcuhcg/17656039042.pdfIn PDF document text
    • http://rodsfish.club/nijapopuwobugozv0l5.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/ifjfE4V/papofifunajelaxegavemu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393641/normal_60045b40946f2.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/wolawatin/zumejoxefowugabetevite.pdfIn PDF document text
    • http://purubonosarule.rf.gd/46608587508.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/lerawo.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/62146738926.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/baking_sheet_paper_reusable.pdfIn PDF document text
    • http://xukajipovaru.epizy.com/furofuwozokulukopomofatez.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/rukabotezokogiwib.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/80195032507.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/59757427066.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/laninapuketotodogases.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB60 5216 bytes
SHA-256: af1949a18f5aa0b0f814bede4cce98f11e2329709e9989805d96abc0989df602
font_01_sfnt_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 9788 bytes
SHA-256: c4afac01749a29d7ee411d66e75f7bbf375eb13d2b9791fa21b250e5b67003b2

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