Malicious PDF — malware analysis report

Static analysis result for SHA-256 718d81d1ab35392f…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 14:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 12301c1d3bab86f4e39f81b804c83194 SHA-1: cbcce92039fc6caf343d67d27f27852130d5c1cd SHA-256: 718d81d1ab35392fcf678dd0fb4ff37b8a78fc10049ee558e443a9f907915f68
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with several pointing to disposable domains and acting as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the final malicious destination. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wix?keyword=dutch+colonial+architecture PDF link annotation
    • http://on24-system.club/60641179584hwg2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_601fdbdb9fd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_60119f2003be6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff0ddcadd1db.pdfIn PDF document text
    • http://closemaze.com/clasificados_el_comercio_quitozzbyf.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/gjmiajF/zokifo.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/c07b8244.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/146077.pdfIn PDF document text
    • http://shoppermarket.online/96793427870abg39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_5fe36cb52ad7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482228/normal_5fd6ca7300f47.pdfIn PDF document text
    • http://webmastervlad.ru/basket_weaving_instructions_for_beginnersx5oqx.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/chhzY1s/59429311714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386842/normal_60047f9e2f318.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/fhiOYif/fruit_cutter_game_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456663/normal_5ff7bd002ca8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602df0b288ee4.pdfIn PDF document text
    • http://hookup157.site/50324082132non5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_5fd2ae7ee3139.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/8753537.pdfIn PDF document text
    • http://axecheat1.xyz/imca_survey_guidelinesb36rh.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/nDoXgfp/xixuzajakilixolamijomu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 4592 bytes
SHA-256: e4f7b27022999aa413762334d3bae27a37d43bd21ea6f838ed508d220b618086
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10144 bytes
SHA-256: b12372c9a8fe21cc386cbfd171a00c34a8dd2edd82d071623f42829108c60036
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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