Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c990277c79e6164…

MALICIOUS

PDF

75.9 KB Created: 2021-02-05 19:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 605b25a4013e35a252fa660ba2a47f02 SHA-1: b8d08987911ecf37474a371ff72904edbd084976 SHA-256: 3c990277c79e6164d941cae5049bbccb8a8e61ada2cf3109a7cac9ed03aad984
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/wb?keyword=appangal%20embadum%20audio%20song%20free'. This URL is likely used to lure victims into downloading further malicious content or phishing for credentials. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=appangal%20embadum%20audio%20song%20free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5ff3111aac1c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_5fe66afd854d4.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/lihiiu6/samsung_level_u_wireless_headphones_how_to_pair.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/PGAij1e/54343462546.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/bvkHlhf/84843494274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387702/normal_5fe1d0d226eb7.pdfIn PDF document text
    • http://zinabexodepo.iblogger.org/zijiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377678/normal_5ffe1d8b35aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5ff116db8e7ca.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/cKnjbYt/clay_crafts_for_toddlers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_6008dc66c1abf.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/rFij4Cq/mycloudfitness_weight_scale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fc98d25673d8.pdfIn PDF document text
    • http://xogezile.66ghz.com/pharmacology_of_antiepileptic_drugs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd2e6f2ad296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_6001c7cf64f90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_6005a283de5e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409256/normal_6003999941e30.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://girodoge.epizy.com/super_toss_the_turtle_apk_mod_2019.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_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 5292 bytes
SHA-256: 80936bb8a524ce5ec0a0365214f0019d4bc88ca5e1145104e9b9fe8db776466d
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10908 bytes
SHA-256: 5b7e02e124decd0f5af6093cc2340e2c90eccdcffe169525d9e2b56c133eb17b
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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