Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa589f29a9184d7…

MALICIOUS

PDF

73.4 KB Created: 2020-11-22 05:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: edc8f401f5e857a349f20ec6cb3dd28d SHA-1: 7b73b24671bb3f257f033b041300e30b3779a6b2 SHA-256: 4aa589f29a9184d7d153431a9a55315674f1e6c6f98e9c36c67aef6e179c6268
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffmen.ru/123?utm_term=organic+chemistry+lab+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5f941b2681b04.pdfIn PDF document text
    • https://nibafowezibinax.weebly.com/uploads/1/3/4/3/134319588/38674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5fa9694eb90d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5fb60a3f7d68a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_5fa359e33db0f.pdfIn PDF document text
    • https://zumabenem.weebly.com/uploads/1/3/4/6/134683433/vodiv.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/zumomasugipeno/asco_gu_2020_agenda.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/equine_influenza_fact_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d3c6a0-fde0-4465-9a34-b646ba191d53/kagajop.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/kleartextbook_workbook_answers.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_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 5484 bytes
SHA-256: 08698973e93d8d365ad60f7b5f4a3fe36f53c4334139bde740825fb1fac48b4c
font_01_sfnt_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 10964 bytes
SHA-256: 882ee95164c75f309ccc5ce6ec6f9603c0f3736fb41cca925dbfa8e394d774bf
font_02_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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