Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccd3677c01badb8…

MALICIOUS

PDF

74.8 KB Created: 2021-02-19 22:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92b284d3c577062f0871ab30c1a09542 SHA-1: cef2d522676c20a8d47c4b924026e19a8290523e SHA-256: 5ccd3677c01badb84627dfe0591ff20d38d69650e756ad148bd59e575fcfa8d0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://maypoin.ru/wb?keyword=i%20am%20zlatan%20ibrahimovic%20book%20quotes PDF link annotation
    • http://operationhomeplate.com/59395210983y7emf.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/e3f3f9.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/sutivulabimunukiti.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/67c925.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/zefidupuj.pdfIn PDF document text
    • http://studytogether.fun/hd_movies_website_quoraq4qe5.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/jojowajobexak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5fe2b9a984e22.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/teoria_general_del_derecho_y_del_estado_hans_kelsen_gratiszalw8.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/smd_components_identificationwsuwy.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/1977946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livixutufedesuv.epizy.com/best_ps2_emulator_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/guided_meditation_for_pain_and_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/lobilel.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/17366637550.pdfIn PDF document text
    • http://fizojigijuzad.epizy.com/american_history_books.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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 5416 bytes
SHA-256: 4b8c728ff62139f4442e409d03206b39422cff9841c98fd214780b80a9c15fd9
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11648 bytes
SHA-256: cdbc046edb056bd514a2c2833a29f277306997bc83fd9b6e41a347d1db32787b

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