Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4bcfe5270c2a4b…

MALICIOUS

PDF

80.2 KB Created: 2021-05-27 11:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 855def160e841acce4d5a97c14ca7e57 SHA-1: 445baba93f3e76fd09906127537216046579efe9 SHA-256: cf4bcfe5270c2a4b4d8663adf443e69aa11f8fcab385c6a7ed86f3701b91fc25
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. ML classification and ClamAV also identified it as malicious. The embedded URL, https://yafferge.ru/strik?utm_term=surface+area+cone+worksheet+pdf, is the primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/strik?utm_term=surface+area+cone+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_6025971009ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_600e7ce012d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_603c34f29fa54.pdfIn PDF document text
    • https://vurinilobato.weebly.com/uploads/1/3/1/4/131454355/1301b5589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_600d63f442930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_600fb45b1aa3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_6005c08fed448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fcea15ab3d05.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/6333984.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/6601069.pdfIn PDF document text
    • https://kazoxinajajidu.weebly.com/uploads/1/3/2/8/132815758/5e6cd8284440.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/627156053909.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fc9f9a484453.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fe0c3c424719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_60049e2da79c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477369/normal_5ff6910ee95ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fc9db4b9368c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_6028281f9da36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cfbdc8-0a73-4f80-ba53-feecdfc9620e/free_making_predictions_worksheet_for_first_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2de9b4-5c02-4afb-99b5-ee65063de898/how_to_find_a_person_by_photo_on_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1eef9e-94e6-4494-a7a6-bc19e9f0b63e/59114337699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c366cf5e-67d0-4bc8-a70e-f5f74f711261/tikigevezojadan.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_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 5472 bytes
SHA-256: b2b812ed73c0278c95b5ebab3774311facfe93a282caf6bd09238d23444a479e
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10848 bytes
SHA-256: cf0ca916e401b385812b690eb2b36c2b962cd8b7d892f3b0b26539a230cdb523
font_02_sfnt_off00011d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 16152 bytes
SHA-256: e1ff9e73d3d9ee8e5a62f2a09dc21f7d475cd47bce628de9b6e664a133017a43

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