Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4132ed28f71e8…

MALICIOUS

PDF

62.1 KB Created: 2021-02-11 06:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5017a4eb2a517289c3562b5bc69ba654 SHA-1: 81477a384e45e4e9e0ec389906a0b5844eb7280b SHA-256: 87c4132ed28f71e8f0fa29d82e54e3583f8b9e8e2d72a368a75dc0eb28d93271
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=hoover+air+lite+vacuum+belt In PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/6772912.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/782b66aff.pdfIn PDF document text
    • https://weneboremuneje.weebly.com/uploads/1/3/5/3/135317625/delivedadosugojafuw.pdfIn PDF document text
    • http://xalufabo.iblogger.org/41914295405.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/aPggn77/guide_for_among_us_imposter_apk.pdfIn PDF document text
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/zowudofupemas-wukefu-wopiwegit-fabuv.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/9569629.pdfIn PDF document text
    • https://zupufirelerige.weebly.com/uploads/1/3/0/9/130969681/7033905075b.pdfIn PDF document text
    • https://mijugojibuva.weebly.com/uploads/1/3/1/4/131482988/7366320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakosorer.epizy.com/53414386771.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/adb_integration_android_studio_3._3.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/file_apk_l_g.pdfIn PDF document text
    • http://zozozixub.rf.gd/tamilrockers_hd_2018_movies_free.pdfIn PDF document text
    • http://gametusepezuka.rf.gd/como_superar_la_ansiedad_y_depresion.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/fairy_meadows_trip_report.pdfIn PDF document text
    • http://gupexofuvesok.epizy.com/play_store_game_jio_phone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/dungeon_master_s_guide_5e_full.pdfIn PDF document text
    • http://rojapaj.epizy.com/37781906568.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_off0000b7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FE 4928 bytes
SHA-256: 4f7e575994192684f0129b308ce7329ef726b0c8b5640c1177fb043f05bbbe3c
font_01_sfnt_off0000c8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B0 10172 bytes
SHA-256: 5838b31a493e828424dc8ee7d0901ed6db7d2933b121571ed12f9d90f9a0ac5d