Malicious PDF — malware analysis report

Static analysis result for SHA-256 610617b7ae73fc7e…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 10:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cd1f18fcab04f8c5dbfb1972cfc8553d SHA-1: a1f9c87729fd9202a3aa22a9e077c130aa45a183 SHA-256: 610617b7ae73fc7eb43d5eae44b2ca3ca8f3e1d031b37caa32279c7c6d951477
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known redirectors and a large number of embedded PDF links, suggesting a link farm. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to phishing or further malware delivery.

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://ggtraff.ru/123?utm_term=blank+goal+thermometer+printable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5fad3c26d996f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f908af44d1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fab1964bd5bc.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/wevumukamuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474471/normal_5fad43e91ebcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_5fa2969b29573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fa92dc2a8259.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/7341782.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/giwem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fa48ed925a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f8dc1a257ec8.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/aedb0ff9-66d0-44c3-a4d8-cf55835b2a9b/zafogusemupuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ff6594-6ee2-4c4c-8d17-6795be76ac9d/wutazixotawe.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/77242267435.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_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 5308 bytes
SHA-256: f298b8f9ae04d33a76b34866ea7f9313e367e5e8352ac9eb5f673f717e1d9b70
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 11236 bytes
SHA-256: cd88f272eb0b2224ac05cdda66d582692ad2b37a29ac677a16787015f77d40fe

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