Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d0f08018f28cce…

MALICIOUS

PDF

80.7 KB Created: 2021-02-03 19:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c27866f984a3315bafcaa086166adb02 SHA-1: b312483b3d2f4a3ce1d39aeed85ea66a607b541f SHA-256: 78d0f08018f28ccebad7d4b419a0fd5300ff5c1ebb162db5375e27da73e5d686
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The embedded URL, https://crophysi.ru/123?utm_term=what+is+a+cladogram+worksheet+answers, is identified as a malicious redirector, suggesting it leads to a further stage of the attack. The document body, though heavily obfuscated, contains text related to 'cladogram worksheet answers', likely a lure to entice users to click the malicious link.

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=what+is+a+cladogram+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fe86a185cfbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_600ce74b02400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479210/normal_5fedd7d01e7d7.pdfIn PDF document text
    • https://cdn.sqhk.co/wuseguwe/iOgi4jf/10_000_dice_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/gWhg5ia/judamikibalumilutanov.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/gjwQgdY/adobe_photoshop_sketch.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/3mng4yN/zong_free_internet_check_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kapimetavis/jI9Taia/bemumixubigewone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe6e94bb1c57.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/xujitezu/ignou_date_sheet_december_2019_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/bangla_all_album_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/colposcopy_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/bar_bending_machine_electrical_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/pajuvakolelipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/45700839112.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/google_chrome_android_4._0.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/labugim.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_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 5520 bytes
SHA-256: 3e633a95c0bdf38d35e3a528f0461c64e16459e68964883949cb9340e221cfcb
font_01_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10752 bytes
SHA-256: cc64e88703695d0d3779ce5884d51133cfe037c0f2a9b5fdd129b9c335536687

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