Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e41c1210283f5f…

MALICIOUS

PDF

65.7 KB Created: 2021-02-12 15:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f5fd1581b0eb1be1085acb2699e1bf68 SHA-1: e1415f4de59c7e7c1fe51dd81f8b471ff783d6eb SHA-256: a9e41c1210283f5fbdfe51e4f8b7e9603a8d22c19c7e6638529bd9b9b76bf748
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to 'probationary period review template' and is associated with external URLs, suggesting a social engineering lure to a malicious site. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://seumenha.ru/wb?keyword=probationary%20period%20review%20template PDF link annotation
    • https://cdn.sqhk.co/vufuvevu/6ggMgft/matopota.pdfIn PDF document text
    • http://esmoney.site/strategic_management_process_in_orderk01e3.pdfIn PDF document text
    • http://vorgazme.com/chhattisgarh_map_downloadl94lx.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/jeKEjht/inside_the_box_photography_tutorial.pdfIn PDF document text
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/jejad.pdfIn PDF document text
    • http://pazobano.iblogger.org/zijudixoforejime.pdfIn PDF document text
    • http://proita.space/what_is_the_angle_of_a_hexagon8dn5v.pdfIn PDF document text
    • http://hookup753.fun/cayucos_pier_surf_reportwigwz.pdfIn PDF document text
    • https://fogevama.weebly.com/uploads/1/3/1/1/131164507/nevajefaraf-xowakamegeza-kotizesuni.pdfIn PDF document text
    • https://cdn.sqhk.co/jevikepuja/p11bFhd/spiral_notebook_making_supplies.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/9086933.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/ihCkdjc/idle_construction_3d_mod_apk_android_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijevisufa.rf.gd/rilafaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/yume_no_tobira_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/sofa_3d_cad_block_free.pdfIn PDF document text
    • http://wotofuwib.epizy.com/search_action_bar_android_example.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/jaguars_injury_report_week_4.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/s_f_u_full_form.pdfIn PDF document text
    • http://mibavened.rf.gd/59397825829.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/dispatch_note_template.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/77768192583.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_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 5324 bytes
SHA-256: 48d231ec9cc60267062d3f0796d39f38af856dcd3e9fe3233a2275c47cfd25ce
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 9676 bytes
SHA-256: fc729c221629b9af527d2fe7e9a3541267400ad98c6f1153688172ad0dc764dd

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