Malicious PDF — malware analysis report

Static analysis result for SHA-256 903e4cc1e8016ee4…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 12:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d1c38880966fe464bb5b5b2fb1013b9 SHA-1: dd58a8ae5f7b7870074dc91ee6c8051db2e6a82b SHA-256: 903e4cc1e8016ee4fab9fbd2adc4d6c7f652a6cf28b53c3e566ef6a6454a89a8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically advertising 'my boy apk free latest version', suggesting a lure for users to download potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous distinct hosts and link farms further supports a malicious phishing campaign.

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
  • 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://vilenefex.ru/wix?keyword=my+boy+apk+free+latest+version PDF link annotation
    • https://cdn.sqhk.co/dilizilozok/eepjcss/37917183337.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/31081887070.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/werewolf_totems_white_wolf.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/milo_manara_sketches.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/song_of_myself_10.pdfIn PDF document text
    • http://polikarmonolit.ru/abc_song_sheet_musicada9o.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/divibezenafoxifi.pdfIn PDF document text
    • http://7evenrp.ru/asap_mob_lords_never_worry_albumnl3i3.pdfIn PDF document text
    • http://jilet2.club/u_can_t_touch_this_song3yrwy.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/66892576341.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/banjara_video_song_number_padal_ing.pdfIn PDF document text
    • http://levelupguild.com/the_human_brain_colouring_book0lydj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijiwaras.onlinewebshop.net/how_many_calories_in_a_fried_tortilla_shell.pdfIn PDF document text
    • http://fefisapuvekebi.epizy.com/manualidades_de_navidad_con_fieltro.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/munoxatuvoxotu.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/marcy_diamond_elite_weight_bench_parts.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/fokiwekusedugunan.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_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 5268 bytes
SHA-256: 02a01b095adaaefc3e8a8092ac2509c7e033f03fddc941aab1e110662bdcbbf6
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10240 bytes
SHA-256: ae3ff1ac1e3018070b337bf0df75618aae8937022948289445928db09bcf1943

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