Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf87b5e9471c31d…

MALICIOUS

PDF

74.6 KB Created: 2021-06-14 08:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 65988e7f6741bfb64c9d853e2bfb8668 SHA-1: c667913165efd383d49844322d1252afa624df2e SHA-256: 1cf87b5e9471c31d96cdd45f58964cd535d551c22f7e997028be6ca9621c8a89
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/pbw?utm_term=jst+jobs+in+sindh+2021 PDF link annotation
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/3589951.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/momegepikuj_wegezijir_nofodaxazu.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/dapewirobeloja-xitew-mukukiwinawitog.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/ef1102358b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5ff0a2215c160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_60c34846baeb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fea38bd268cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_6028b2258b500.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/6691021.pdfIn PDF document text
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/51649fbafb.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/dizebiluzilu.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/zenodul.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/komogowugepojokazale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6300d7-94de-4e1b-9fa7-7a0d00dddee4/roziwufaveziwitonidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a047d62a-3c60-4683-9b34-c980201cd9c5/derutagidefuzekaji.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/fixenukavigifagajudebofi.pdfIn PDF document text
    • http://wizepexu.pbworks.com/w/file/fetch/144648936/how_to_get_unlimited_money_in_simcity_buildit_android.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/145156011/priest_nature_resist_gear_wow_classic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574a7501-ee4d-4f98-bde2-d05d5e6879ec/geometry_dash_lite_mod_apk_android_1.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425085/27899630881.pdfIn PDF document text
    • http://tuluxevan.pbworks.com/w/file/fetch/145114275/nuwavutowan.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/f/smeg_coffee_machine_instruction_manual.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/w/file/fetch/145230180/need_for_speed_carbon_psp_iso.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427329/libaxejesozozizubu.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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 5108 bytes
SHA-256: 20ec21c9b7fb551c05af841a771045246676608e99ddfeb8057f899dbcd8a995
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 10960 bytes
SHA-256: abc708c08f9a94dc20ef8c14fdfe7f7372b123ce0eb3c9b36199247b3599bd42