Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ea51d65e06d775…

MALICIOUS

PDF

102.4 KB Created: 2020-11-26 05:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d55d6550f5272881c323cc91d1f91d89 SHA-1: 9930d4b7fb303acad530f19ead025ed06442cc63 SHA-256: 50ea51d65e06d77517b04e794aafe6b26d4f7319ebfdc1ea866915559ccbdc4a
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URLs point to known malicious domains and infrastructure designed to lure users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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=marginsplot+varlist+not+allowed In PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/fuxupurebekegolutopa.pdfIn PDF document text
    • https://mizitixas.weebly.com/uploads/1/3/4/5/134589849/rajinor.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/6ae3fe7e-a430-4e29-8849-f8e24eef54d0/fobosisuzefajitewaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881f7380-5d1d-414a-9092-8755369ae3ec/vatutivima.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/nexakewuzesamajezulozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9402c36e-eddf-492b-a158-68694e7be5f5/72937248309.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/bowezuxejuduso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62ec92e-0777-4a43-abb1-754f307647cf/vokunegijirij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344e3384-e75e-4470-8431-81a987bfc355/lukudowonox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186b0d01-02ed-47fa-8f78-5a45421f3528/active_listening_skills_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047a5f41-6189-4a56-8b59-17889f2fd689/raven_progressive_matrices_answer_ke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fed614b-4f30-4c7b-b11a-173267f8b206/51990939722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412572a1-80fc-4a6f-804b-cbc7ae16ffa5/.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016ed4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16ED4 18224 bytes
SHA-256: ee97ea15713fc4130eaa4bd3b134b0cda0f1bbed242f03c9a2e9cf825269e8c8
font_00_sfnt_off00013573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13573 5284 bytes
SHA-256: e463c4f8053e96f2b247efb5ccb6be040e83ddff4a2eb9b002172e295ea32ec6
font_01_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 11380 bytes
SHA-256: c093bed696f4d70113f4b170ff4dd4caf2ac18a8e50dab954ba89cf369801f92

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