Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e54ae958c9c887e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-20 14:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89d92f936c387fc33386db340dc35c92 SHA-1: 7869a65400761f1528c8e434a1817eabdc92d380 SHA-256: 4e54ae958c9c887e7d424ad7d654c0d32c28bb7e590a6340b108ba1deb9851ba
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=flower+structure+label+worksheet
    • https://xekixaxaleza.weebly.com/uploads/1/3/2/6/132695200/gilowodoni_vegetukuzolel.pdf
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/adb7d96204.pdf
    • https://cdn.sqhk.co/jaxaletadi/cjgMhaE/tricky_traps_tomy_amazon.pdf
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/8618993.pdf
    • https://baputopozim.weebly.com/uploads/1/3/5/3/135336161/610ad464857.pdf
    • http://keberumapup.22web.org/badoo_app_crack_android.pdf
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/670cd8d0.pdf
    • http://zukirudon.mypressonline.com/manual_chimie_anorganica_clasa_9.pdf
    • https://cdn.sqhk.co/kigoxeni/ehijjfX/nixuwelediwilukajezoro.pdf
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/ridurimopen_golegazivomen_nefomikifukemem.pdf
    • https://kovapuneluwaze.weebly.com/uploads/1/3/2/3/132302913/bimefolesivuf-wipatabeta-dopuditegedewos.pdf
    • https://cdn.sqhk.co/busudijul/ibhhigN/xavezogipidemakufi.pdf
    • http://zawuruliwisevo.iblogger.org/zebefa.pdf
    • http://gadatoreneperil.mygamesonline.org/how_do_i_activate_call_waiting_on_my_panasonic_cordless_phone.pdf
    • http://terugate.mypressonline.com/why_would_my_check_engine_light_be_flashing.pdf
    • http://vomamafawib.scienceontheweb.net/93126142994.pdf
    • https://cdn.sqhk.co/wadelovelo/gcYidje/colors_of_the_wind_sheet_music_voice_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sitalagok.rf.gd/59733671450.pdf
    • https://s3.amazonaws.com/legapatatezisa/33876038457.pdf
    • https://s3.amazonaws.com/tokit/22001336644.pdf
    • https://s3.amazonaws.com/rexogeguxosix/jazopoboba.pdf
    • https://s3.amazonaws.com/vezumobigodub/king_arthur_brownie_bowl_pan_recipes.pdf
    • https://s3.amazonaws.com/foneniz/10259780678.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_off0000ed64.bin
49586b46b112c5ad9deacc68c00395df7f3cceb29d7eed3373dad3d314ffc182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5136 bytes
font_01_sfnt_off0000feef.bin
1e712675c1949a4903ae53dbd47043e525b2f2fd41cd6d80f579b8fb3d8cb840		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 12192 bytes

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