Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dd229303a4b6ce…

MALICIOUS

PDF

83.3 KB Created: 2021-02-15 22:09:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7f514c8e7b501bbc470172bd30000c2d SHA-1: 0d2124502205a70c102b0fe1f40a5997c883718b SHA-256: a3dd229303a4b6ce4e338b456281b2ad1d2280c2a361679cd7ec8fbcce6f57df
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/123?utm_term=is+dog+dna+testing+accurate'. This indicates the document is designed to redirect users to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=is+dog+dna+testing+accurate In PDF document text
    • http://webpost.pro/encyclopdie_universalis_gratuitegb9g.pdfIn PDF document text
    • http://paktum.pro/smith_s_pharmacy_hours_valle_verdevdp5g.pdfIn PDF document text
    • http://remont-kholodilnikov.website/what_is_the_best_heart_rate_monitor_for_pelotonz3nar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385010/normal_5feb940ecb19f.pdfIn PDF document text
    • http://letekidela.iblogger.org/bidalol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fee370e45e6f.pdfIn PDF document text
    • http://busivel.xyz/god_of_war_psp_cso_fileauphm.pdfIn PDF document text
    • http://sasezifunapa.iblogger.org/succinate_dehydrogenase_assay_lab_report.pdfIn PDF document text
    • http://salonvarna.com/lizagituzijewetuwosojy1mh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5ffb5bb73e6e7.pdfIn PDF document text
    • http://optalpha.com/math_worksheetsinnz3.pdfIn PDF document text
    • http://vigastlens.xyz/mosekamokofikulimupilo3wtw7.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/tajimipojimo/pazupa.pdfIn PDF document text
    • http://melumudinev.epizy.com/78225380737.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/deburring_machine_for_sheet_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/binomial_probability_examples_with_answers.pdfIn PDF document text
    • http://nanesipub.rf.gd/12682425727.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/opera_mini_browser_old_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/95086293141.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_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 5012 bytes
SHA-256: 1c5a28b81ab17558ea3a56680e864977304fc631f3528009901734516cb16796
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10796 bytes
SHA-256: a659de0d6b86cde337f1f203a1ecba29bbb866bf73588012dfebc56452efdefb

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