Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd787e3ec9926a77…

MALICIOUS

PDF

75.3 KB Created: 2020-11-25 18:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 48bfb224f9e11b850dbf52757325e594 SHA-1: ee6a4f174f8c5f98cbe4855bd3c7e856037d1ff2 SHA-256: fd787e3ec9926a77ea08a403e8230c1ffaa5d0509c961d647887eae09e674aea
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to educational topics, likely serving as a lure. The presence of numerous external PDF links, including one pointing to a malicious redirector, indicates a phishing or scam attempt designed to drive traffic to malicious sites.

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://traffmen.ru/strik?utm_term=what+is+percentile+rank+in+education In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f8abbcde99b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f91f89a75a11.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/zepav.pdfIn PDF document text
    • https://revejoduxu.weebly.com/uploads/1/3/4/2/134266419/58cd1a73c3e89.pdfIn PDF document text
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/e3d0d69f5.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/dinilederu/copper_sulfate_hydrate_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcbbce0a-4a2a-4f8d-b246-cc30cb6d33ea/bajar_musica_gratis_de_jenny_rivera.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/ashab_kehfimiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/chak_de_india_song_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kimoweworape/ufc_237_free_live_stream_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/entrepreneurship_policy_theory_and_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/perkins_4_108_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/amazon_kindle_paperwhite_2018.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 5236 bytes
SHA-256: 87eb09c3614d11becf606b57fd2d80f6f1bf1b2cd5d389b1321188721eb321da
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 11016 bytes
SHA-256: 3a7da9307846f759c95a14a3d6b659741d7481112afe591d048637da2cbbd7fa

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