Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3ea1915be1a3bc…

MALICIOUS

PDF

70.7 KB Created: 2021-01-09 18:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 31686eb62f4ebdb5f74f606ebaed7540 SHA-1: 7ca1f826a7d0c1a508cf291d24f12c6c933effdc SHA-256: 2f3ea1915be1a3bc703b4adf4514d7be93d6be956c60387747e22d09e4c8a002
252 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or malware distribution attempt. The presence of a large number of external links, including one pointing to known malicious redirector infrastructure, suggests a link farm designed to lure users to malicious content. The document body, though heavily obfuscated, contains references to 'jeecup answer key 2019 sarkari result', likely a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/aws?utm_term=jeecup+answer+key+2019+sarkari+result In PDF document text
    • https://lusevidumew.weebly.com/uploads/1/3/4/7/134741371/misilonexalopev.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/55fadbcf21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_5fcbba89f267d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5fdc7bdc51858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fdba9f8a0f3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_5f9e227282b4b.pdfIn PDF document text
    • https://rotedovifiwi.weebly.com/uploads/1/3/4/8/134846651/3565587.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/julol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fc33e1f510e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5ff82d8a09a89.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/2ecdc280ff55fff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451352/normal_5fc8d9ddea9e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5f954c4d2bb77.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/hflnhiS/zamokejerilemaniwazama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_5fa295a854ada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 5656 bytes
SHA-256: 174bbe6c1f4decbd6109a9859e46757bd4a21eb379784343e1184fc71752abac
font_01_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 10716 bytes
SHA-256: 378142fb3f743249effebfe7898f0c6a18e3b0724d5b06b253ce3a035fcf3324

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