Malicious PDF — malware analysis report

Static analysis result for SHA-256 386094f17f1ca7b7…

MALICIOUS

PDF

96.6 KB Created: 2020-12-22 20:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0f4e027f7b6677843a68e3ce9b87f225 SHA-1: 9c1664f091761a495b5298bdeb56b010628314f7 SHA-256: 386094f17f1ca7b7570dd70401ffc832bf292620af2ffdfd7d0396d911f5d852
156 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 by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to potentially malicious domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/strik?utm_term=animal+road+warriors+son PDF link annotation
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f9dc8594d551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f9c33f681235.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/3932329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f89129f18905.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457843/normal_5fe120cf20a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462376/normal_5fa5015f431b9.pdfIn PDF document text
    • https://nunamazo.weebly.com/uploads/1/3/4/3/134311680/3110525.pdfIn PDF document text
    • https://sudewivozuv.weebly.com/uploads/1/3/2/3/132303071/gigasewu_timedog_tobegijidu_pilali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f9cf97e3d040.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/3777857a-3064-49ea-ba20-f5e9e6786347/animal_farm_chapter_7_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf1f8a3-63d6-4ac7-8f5f-d84803c428aa/vawanavibelofezoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b7b175-dd8f-4d31-b63d-8ebf9bbf09b2/mens_fuzzy_socks_old_navy.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 4928 bytes
SHA-256: b90f786123e2006c529f6074a2a200a17f43878ca27e703fd1b0e48ff893e187
font_01_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 5052 bytes
SHA-256: 3c124c147dae0bc4b02364bd6e607140975368cc450ff652cecc344337e41b9b
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 11556 bytes
SHA-256: d4a42178b38251afd88f7fa8c589355c6056b805f5e3ffd511ee32efb9c3793a
font_03_sfnt_off00016583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16583 6128 bytes
SHA-256: 703b492801f4a4a32c877a4e1f75409717fb81514009855826a2b5ae329b6d13

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