Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c378caaa3268fa2…

MALICIOUS

PDF

77.3 KB Created: 2020-12-06 00:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bb2f9b0224940e58d72aa3e8166929af SHA-1: 8914e14fe6773652497eb7c867f3d1fed70c2e0f SHA-256: 2c378caaa3268fa25cb1284ddf54e40e54d1180754cb788decfb79d8ca4fecdc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links to known malicious redirector infrastructure and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to a 'student guide answers', likely a lure.

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://traffmen.ru/strik?utm_term=the+cosmic+distance+ladder+student+guide+answers In PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/kigesej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fb32ae579478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fbd575937f99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fca998cc0bb1.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/b36898a4-61ae-47d8-ad8f-018454b739cd/28680663799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478fddc7-35ce-48d7-975a-90f63e97660b/23594134194.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/74022550814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2d5966-c007-449a-9dde-107274d61684/blue_ocean_strategy_institute_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed22c1ee-1869-4ee7-8981-d4e82e6b4031/99469407296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93951f92-4f16-4b7e-aca9-18a60cac3d2f/sobiwekuzujufegexera.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5396 bytes
SHA-256: 8aefea5f03e11a855f24653b7ea410a0a2143f0121782d5632208dfa89f8f75f
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 10836 bytes
SHA-256: 05cdd1206eab3cb35c9c130366c4af836ab4069a6a6f2eda24a110d0106e87ca

Open this report in the interactive analyzer, or submit your own file for analysis.