Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1fd2f2cdd1957c…

MALICIOUS

PDF

92.4 KB Created: 2020-12-16 20:39:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8e1fc3107d6d1fa5cdca085a3eda5046 SHA-1: bbda53fd334ab4cf89757536b26ef5ca577d2ee6 SHA-256: 7b1fd2f2cdd1957c3a2cf5b70143edfd722702088cf1589589ae449821ed0185
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/123?utm_term=the+constitutional+convention+worksheet+answers+icivics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fa409bbdc8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd96acab99bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8dd16d558d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fb29f1a085b7.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/a055b006872f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fc06d0843bad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc640b15c8bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f8aa127d0550.pdfIn PDF document text
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/mepot-dewaleleto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc78d8be9133927d90f7fcb/t/5fcd2c4acded405bb8e21462/1607281740377/mgm_grand_detroit_spa_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9379a7-1b17-4be4-a2a1-94ee5a94f033/sexamegujanosaburileziguf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3486312facd59cebc5192/t/5fc3e1069ee0f32b87cabf7a/1606672647166/zisujat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78d8be9133927d90f7fcb/t/5fcd2c04e43f2b00a8b19a3c/1607281671731/fun_race_3d_games_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54dfe3dfdd95b60f249af/t/5fcc7189a87f9f1b19d166aa/1607233931604/82915799410.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_off00012e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 5052 bytes
SHA-256: 7b2474ed7374549b17df1df25ba5bf8360f7b6ee7084ff461e7654ab0512eb1e
font_01_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 10780 bytes
SHA-256: a7746e97fab18671f604fcc1f0f5e2f70262e8439c2269ba9cf7533411aee86b

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