Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38f5706d61f97eb…

MALICIOUS

PDF

86.6 KB Created: 2021-03-26 15:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 388f2fbe0de1832de12b6e84a0083ea0 SHA-1: 215ef6f2e895a48acae805c2331c58a61c9f4874 SHA-256: a38f5706d61f97eb15d2f8a56803d44bff4e4fc663e27087260153bd747f3b87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=chartered+financial+analyst+course+in+kerala PDF link annotation
    • https://cdn.sqhk.co/busumodofu/ibOGOib/farofevef.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://busforpay.online/dinuxobipukelosavavuluozylu.pdfIn PDF document text
    • https://dazifefizax.weebly.com/uploads/1/3/4/8/134854215/togav_pimel_xaxezi.pdfIn PDF document text
    • http://storeeuro.info/is_the_playstation_gold_headset_worth_itf264e.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/zHhadjd/duluzimejuzupasavevaduz.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/rCjg0US/vopebikuxunubazekemo.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/jg3ophj/winking_lizard_tavern_akron_oh.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/jgSgIPJ/how_to_unlock_throwing_knife_cod_ww2.pdfIn PDF document text
    • https://cdn.sqhk.co/maxokekoxo/ifDjcgi/mesosuxajow.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/jhjdhgg/free_app_maker_software_for_android.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/shri_ram_janki_song_downloadrghah.pdfIn PDF document text
    • http://relax35.ru/qu_debo_hacer_si_tengo_sntomas_de_coronavirus_y_cundo_he_de_buscar_atencin_mdicac6x0b.pdfIn PDF document text
    • http://sandiego-podcasts.com/zaxemefunudikemuxomuxodibb0g8c.pdfIn PDF document text
    • https://bimefitovaj.weebly.com/uploads/1/3/1/4/131437299/ec34005493c.pdfIn PDF document text
    • http://rm-swis-mine.com/what_is_share_market_in_telugulti2m.pdfIn PDF document text
    • http://flowerport.shop/xogilosuzilr6d51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 5180 bytes
SHA-256: f414e7c353abf778542921ddd387c07a888f837a94371e8c6bacf0edd1d1222c
font_01_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 12968 bytes
SHA-256: 66312394bc98dd31c330801452ea71919241a084e3617e539f628fca9ed530ff

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