Malicious PDF — malware analysis report

Static analysis result for SHA-256 998a4928778209e9…

MALICIOUS

PDF

86.1 KB Created: 2021-04-06 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f350f2eb09ff73ba6875710357ff24e7 SHA-1: 1ad89a0e3c14ab87281d1c3356a53f007d3c9fa0 SHA-256: 998a4928778209e998fae3f6c2134291c6170e45178bc9840c17565e14626aef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • 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 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://druttle.ru/123?utm_term=ssf2+online+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490132/normal_602626a74aad2.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/zaxenabe.pdfIn PDF document text
    • http://vetozadep.mywebcommunity.org/fofuvurifimusevudetozuti.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/zevezozukozogumedobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60217837e4c4f.pdfIn PDF document text
    • http://snt-br.ru/sibigofepizawuvi5v1t5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_5fd8772e5ddfb.pdfIn PDF document text
    • http://kexedeziferu.sportsontheweb.net/vexixezoragumu.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/q_see_app_not_connecting.pdfIn PDF document text
    • http://begetus11ppz.xyz/puzitvvm44.pdfIn PDF document text
    • http://subonus.ru/melalitavumusest01l.pdfIn PDF document text
    • https://raketesi.weebly.com/uploads/1/3/4/6/134632322/xajolenuk.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/70695158242.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/advanced_computer_architecture_kai_hwang_second_edition_free_download.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/4188788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fdfdcf5ad8e0.pdfIn PDF document text
    • http://watepavamosem.sportsontheweb.net/job_application_letter_for_teacher_sample.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/307117.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/ff707d80-2ef3-4438-83b3-ccb5eb9cad50/tabla_de_distribucion_normal_estandar_completa.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/83665258554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6691ae-7b2e-45a2-90c0-ab2075f44d3f/meboxoloseze.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5004 bytes
SHA-256: 8b87357cdd7656ad13bedb141838a4a11e2dc9cf82e68ec817c8de28c26bd69b
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 11684 bytes
SHA-256: ff476697f5b8a947d249c71dee54120fc4fc387f0d1c08213692a79ac17b33ff
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 16216 bytes
SHA-256: 0488c9f99e0fcd21ca2988e9d429c6d59fec344e78892dfd70b5e7a88f9c948a

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