Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3e6727e6c8e4e1…

MALICIOUS

PDF

77.6 KB Created: 2021-04-12 18:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66a617ba90daeb56f730d413fccd1b1e SHA-1: 7f5889dad5732e66194226e4435fd09e08a093ac SHA-256: 5f3e6727e6c8e4e1068464f6766bae0f5e1467830d350b0a9c85135fd0b25000
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a site related to 'ICD 9 code for general fatigue'. This URL is flagged as unknown reputation and is the primary indicator of malicious intent. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing attempt to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=icd+9+code+for+general+fatigue
    • https://bazuxenulasiv.weebly.com/uploads/1/3/0/7/130740357/rofulorojamepotow.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/6566655.pdf
    • https://cdn.sqhk.co/suxavawudomo/h08LXjL/jololusesopemup.pdf
    • http://xeratigike.medianewsonline.com/pdf_search_engine_open_source.pdf
    • https://cdn.sqhk.co/sinupupuzaxa/wyhaD8c/zuru_x_shot_bullets_compatible_with_nerf.pdf
    • http://xiluzoxasefeb.iblogger.org/what_is_the_last_book_in_a_song_of_ice_and_fire.pdf
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fef709d6dfeb.pdf
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/paxifupumoko.pdf
    • https://cdn-cms.f-static.net/uploads/4477878/normal_601a154f987dd.pdf
    • https://cdn-cms.f-static.net/uploads/4422371/normal_606466feb7bc9.pdf
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/lupolulaw.pdf
    • https://static.s123-cdn-static.com/uploads/4413454/normal_6007306c47ca0.pdf
    • http://povulofi.mywebcommunity.org/what_is_the_structure_of_a_formal_report.pdf
    • http://lafovug.iblogger.org/21231407491.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fezenur/97973421427.pdf
    • http://kidoputuf.epizy.com/rirexuzuxusa.pdf
    • https://s3.amazonaws.com/napoledunadigo/what_is_the_function_of_strip_cropping.pdf
    • http://jogagogaxunu.rf.gd/pejol.pdf
    • http://kalasoziluxolim.myartsonline.com/48761159072.pdf
    • https://s3.amazonaws.com/bewibiwat/kojizotexixuper.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ce.bin
9b533161b669fd6bcf8f18150a74b684c4569bfe1d7f82d165006f17805b6342
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 5104 bytes
font_01_sfnt_off00010440.bin
1bb03cdf2c34af08d3d9099f3a738d12fd20c44cdc71d760e06efc7caeff3bb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10908 bytes