Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba65775e568e900c…

MALICIOUS

PDF

84.4 KB Created: 2021-05-11 06:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ccf9145f090ba6b6480b24b075b09e29 SHA-1: 73cbc0a8cb9848759eef49b3d83cadb83449fbb4 SHA-256: ba65775e568e900c3b2ea508478e23005448101a91cfaee92860a7a5e4e280d6
194 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 0.9993

Heuristics 7

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=samsung+ml+2510+treiber+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6065519b20958.pdfIn PDF document text
    • http://organicnu.info/bazatejakotutegl2jo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_602ff134c03d9.pdfIn PDF document text
    • http://homearfes.com/kudikerujixupowzc0g3.pdfIn PDF document text
    • http://ridunculus.com/henry_tropicool_roof_coating_reviewsjrsjq.pdfIn PDF document text
    • http://nubolutlion.xyz/99134662882yqa5h.pdfIn PDF document text
    • http://yesitalia.fun/66048809339cd6cl.pdfIn PDF document text
    • http://expo-kit.ru/replacement_parts_for_briggs_and_stratton_engineszmavr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fda74e0eea16.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/feropuwokosef8wcim.pdfIn PDF document text
    • http://smartbright.club/tepumojevudilipu585ye.pdfIn PDF document text
    • http://flymoney.net/877974974735jpdy.pdfIn PDF document text
    • http://pocki.top/virepulimowapogeliwibujidtbyq0.pdfIn PDF document text
    • http://quickpapp.online/comlex_level_2_ce_score_report2zr3q.pdfIn PDF document text
    • http://trendmobile.ru/fm_radio_circuit_diagram391ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_6040f23eab43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_604a40c770ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_606dffa63ce1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_6060416f95361.pdfIn PDF document text
    • http://kemytbok.xyz/singer_6235_oilingtd78m.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a9d52b7-bae8-445b-b6d2-8eba0f02533c.filesusr.com/ugd/729231_679c1145c6ad42c1b69d1d2cb66cf421.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_2f81456fe8dc41b18ff984d052f24181.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_c523b7e802ad4ae2b355e1befcb50a05.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_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 5928 bytes
SHA-256: c63692e6f73068b2f595426e86c93b8fc2195b2b48842209ada2ba080c31302a
font_01_sfnt_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 11224 bytes
SHA-256: bb9f46ffeff1246b476f49e2ba9e0fa860cfec70cf6ceb3f9e3bc2fad3ef9854