Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8b622935545d30…

MALICIOUS

PDF

78.3 KB Created: 2021-03-14 01:30:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 14705eb38b6a2476380aeff0a245f809 SHA-1: b2a2ac660a470f60b1a27f62b7089f6ddd2f6014 SHA-256: 5d8b622935545d30ba7984a4affed02a48b1252b1df2a27383d0026f5c575bd8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious or phishing sites. The document body, though partially corrupted, suggests a lure related to 'Snooker cue tip size chart'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://fokemale.ru/wix?keyword=snooker+cue+tip+size+chart PDF link annotation
    • http://dipenoguzel.sportsontheweb.net/60785874858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_602464fe92584.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/la_vida_es_sueo_cervantes_virtual.pdfIn PDF document text
    • http://keksik24.ru/how_to_program_overhead_door_remote_controlwo6n3.pdfIn PDF document text
    • http://usesoda.pro/90416565015zutis.pdfIn PDF document text
    • http://santecmb-sarl.com/jarudizoxividojeloxujukvefr.pdfIn PDF document text
    • http://lofitner.buzz/download_kinemaster_support_video_layer_apkv9wu5.pdfIn PDF document text
    • http://greatholl.com/point_guard_workoutwa35c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_6029402212dd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_602a735bc02f0.pdfIn PDF document text
    • http://akfb.online/jeloribokebokabegg4c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_60242d723c5b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_6023d8ccb6b37.pdfIn PDF document text
    • http://labiosdewonda.com/kindergarten_readiness_activitiesbliyv.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/espacios_y_subespacios_vectoriales_algebra_lineal_ejercicios_resueltos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_c9e77d67293b456db56d1d4935572eb0.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_3fb22b1cddf7468b9e0a68352fea880b.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_39a60427cbaf461ebf2bb94d3bb847d9.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_5afa662f78834ec7ab33dc6b38e6bc8e.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_e86353f99e184220a72a31cd5b107182.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_1b8b6252787d4fc5a7b4c87b7fba9c79.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_b3e6cdc0de0a42208ed9abb2ddbb08f8.pdf?index=trueIn 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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 5208 bytes
SHA-256: 9d7aa03a69c1578598d07bae350e561bebd6ef3e79d808eb72d668efaab1256c
font_01_sfnt_off00010572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10572 10872 bytes
SHA-256: eda89aa99b05f028f307b3ee41870742744802ff24416491a889c818857b972c