Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c1238acb66e4c4…

MALICIOUS

PDF

69.2 KB Created: 2021-02-20 02:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 51fc4e01387d0595cd4f6e9c7f372afc SHA-1: db752726b1a42f7031e77398bb44d0fe4b2f7ba8 SHA-256: c0c1238acb66e4c486e0da9fe8ff039362db43187933943366339973bfba5286
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=what+is+the+best+eaton+fuller+transmission PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6030507ab3bae.pdfIn PDF document text
    • http://olx-delivery.cc/tovubozavekofivavopox10jnb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5fe77824bbd74.pdfIn PDF document text
    • http://edaruzal.xyz/pearson_realize_math_answers_geometrybnw3u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_601fc43c46193.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/157d7386f85ba8.pdfIn PDF document text
    • http://businessoutsourcing.org/why_is_gdp_a_good_measure_of_welfare2qjd9.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/3692470.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/61799721493haia8.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/5610558.pdfIn PDF document text
    • https://potijesidademut.weebly.com/uploads/1/3/4/3/134351663/4985150.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/66280729286y550m.pdfIn PDF document text
    • http://rte-ita.fun/foxbet_super_6_winnersy5bk5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/igi_global_journal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/avast_antivirus_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/76398597465.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/chhello_divas_full_movie_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/free_lagu_azzara_band_alala_sayang.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/fighting_monster_meme_template.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_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 5160 bytes
SHA-256: f9fe79ad8a0eae2e35cf26ca5367c4e4cdab97ea30d970d3e659c8e633e0ab0d
font_01_sfnt_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 11152 bytes
SHA-256: 0f42ecb1c7765617d18a5cb1a3a7d7c330fdcd5e3c9f661ca91aad010ea981a7

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