Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b3d79c4299d909…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 10:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 92cb1f328c1d6bf5419dc79f136429ad SHA-1: 27664009f36f7114fa267ff7b8389bc7e8683e92 SHA-256: 28b3d79c4299d909bb27aea2be9acda8ca5cb85126bd6ca1d67c2818d8648d7a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Calus raid guide', likely a pretext to drive users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=calus+raid+guide In PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/vejuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_5fb34c4c9997a.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/1700446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5f98190275da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_5f8abe5a9b305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f87b6bac6db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_5fab79a48ff88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_5fb2e3d5f2ec7.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/d8340594-6723-4068-960d-1b5112774ecc/72366661190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffbe78a2-0f2e-45ec-bc95-013601fd5417/xozefuruxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/29405373529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2436021a-bea7-4a9e-b003-83e892cb71cf/visualizing_nutrition_4th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc6c02d-c6e8-4603-a66c-3af88f49da23/10050448713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afedfb21-32ac-4140-819c-43fa6d6d7f82/webixegiwegupunof.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 4896 bytes
SHA-256: e4925f5fabde6a6c58850a5bd39b34fb9af5e1feff02a3dc4c73e41d55df3213
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 10028 bytes
SHA-256: 43be846e87fe2bee737803ec36760c8beaa7fcd6e3b3b2b4e987a859e57c8573

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