Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8d927fb8be0f17…

MALICIOUS

PDF

67.7 KB Created: 2020-11-26 00:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fafd550e87232a893371c39b6aa360f5 SHA-1: 9c284be03ddc22ae2d4bb48e395b14e5584d1ec8 SHA-256: 7d8d927fb8be0f1703831a5e469f928c23d8041ba8bc1d44d7e688c45c3af4fa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=glencoe+geometry+skills+practice+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5fa73238369a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5f93cd98f1130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_5fa07d25c217d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fa7f934234df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_5fa830c750984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_5fac5765efeb2.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/2828391.pdfIn PDF document text
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/8609942.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/vazutenotelum-xusesorukis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f9301c3ddfb6.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/tetazino/37514475532.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/nirofivibudedozazefi.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/126376117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77894756-d0b4-41a5-9871-b94561add6ed/javizu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/38176972531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcfe99c8-c216-4b60-8a82-84a487c1db48/47034699784.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_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 5540 bytes
SHA-256: 8dcf70791ae3e884350e7dd663db13474eadea972847cffcabaf98af9b6422e6
font_01_sfnt_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 10080 bytes
SHA-256: 837ffbb416f1443976daaf97979a5a0d369ab16111963960b471845ffddf8454

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