Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7facde3e39a6a9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-03 14:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bce822a89f2c005c4090628b4aa0d089 SHA-1: 7fbdfa14ed2c37ee1ec231f01e28e27d1f1f4bed SHA-256: 5e7facde3e39a6a9dcfdc59dc9c761b66ad0abe937f77241c1276aef8fd1229c
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains a large number of embedded URLs. Many of these URLs point to known malicious redirectors or disposable hosting, indicating a phishing or spam campaign. The document body, though heavily obfuscated, appears to contain keywords related to 'bankers adda current affairs august 2020 pdf', likely a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://crophysi.ru/award?keyword=bankers+adda+current+affairs+august+2020+pdf In PDF document text
    • http://misirabul.22web.org/cymera_apk_latest_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60342652d4e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_6053bb9668f82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5fec0d2f6c18a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_6009f599d585b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411686/normal_5fde68753a30e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd1749e0f0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_6046d5245646e.pdfIn PDF document text
    • http://dimapofisapa.22web.org/tevatowabagewiwizuverafal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_600816a84059b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_6064e3cb795bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_5fe13bde0ec34.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_b415d7efe8e342f59ba839b92fdcac99.pdf?index=trueIn PDF document text
    • http://sefogozi.epizy.com/16592273599.pdfIn PDF document text
    • http://xidatozekef.epizy.com/behance_apk_old.pdfIn PDF document text
    • http://somaxowirotiko.rf.gd/latest_cg_song.pdfIn PDF document text
    • http://fexagoxira.rf.gd/kajaria_bathroom_tiles_catalogue.pdfIn PDF document text
    • http://rufedum.rf.gd/free_math_worksheets_for_grade_4.pdfIn PDF document text
    • http://keputeka.epizy.com/soundtrack_na_hmunpui.pdfIn PDF document text
    • http://dujisuga.epizy.com/english_grammar_printable_worksheets_for_grade_8.pdfIn PDF document text
    • http://famigobefil.epizy.com/arte_barocca.pdfIn PDF document text
    • http://keguwaburafokul.epizy.com/maveferorij.pdfIn PDF document text
    • https://db85890e-2170-460b-8606-66f64b7b3c0f.filesusr.com/ugd/1d3654_8a2e081186e14e38b527634e6c583061.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_36d20d9db11e4d56bd677e9972d456c0.pdf?index=trueIn 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_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 5676 bytes
SHA-256: 73a2793d4e927bcaafd2e8f694b08885cad4e17e5b643a55d3a7065d16f624a3
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11312 bytes
SHA-256: 1d7dd98f27bfe989f2360c2ea5f3df83c3f5a96838eb12609e0ad25d619e9f7d