Malicious PDF — malware analysis report

Static analysis result for SHA-256 52122a3110ba295f…

MALICIOUS

PDF

65.0 KB Created: 2020-12-13 13:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f62e009ac37748dc4c85376d22887764 SHA-1: def479196b73f1f251e61abdd1cdf8ee871d430a SHA-256: 52122a3110ba295f602e7a9faae467a3435a510eb6379854e5c3ef194c4439c5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. No scripts were extracted, but the presence of malicious links is sufficient evidence of a harmful intent.

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://cctraff.ru/strik?utm_term=open+session+in+view+spring+boot In PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/5240354.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/b3c1a14d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385852/normal_5fd3319fc6820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455196/normal_5fc6d91cbaf72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f9c834c488de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/9252218913.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/17097008398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dcf997-1e6a-48ef-8bcf-4d7564380a9e/12240311840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46865880-a865-4d40-9f08-8d73a492beb8/jhing_jhing_jhingat_video_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/mijujaditubaxowipefa.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/kulevasapulirila.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56d23ff13940aa25df82f/t/5fc7020d7995075abdd90f78/1606877710081/download_hero_jump_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/60743477153.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_off0000c291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC291 5064 bytes
SHA-256: d265cc28d6894483ef16d6ea46c9e956c032d7eed9c50146c9f14c373bcae0c1
font_01_sfnt_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 10324 bytes
SHA-256: 9cff12e445a49acd467bdd4efa86cc7a69110e9a666ff38d494dc4b5fcddc1e4

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