Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71efab184fda303…

MALICIOUS

PDF

72.6 KB Created: 2021-03-16 07:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9e61c1c500f81b6b449b4f31b3eb7763 SHA-1: d44d32eb2b13d4c048970e9e780347c0cd4d1ef5 SHA-256: b71efab184fda303ef3abfc5687e742456484205b57e57d8f04b22eecb150960
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to what appears to be a link farm or redirector service, specifically `https://xezojetit.ru/strik?utm_term=platicas+para+bautizo+en+queretaro`. Heuristics indicate this is a phishing attempt, and ClamAV detection confirms it as a malicious PDF. The presence of embedded JavaScript, though not explicitly detailed, suggests an attempt to automate the redirection or exploit the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=platicas+para+bautizo+en+queretaro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365634/normal_600fdaa5229a8.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/8ggwdAs/skater_boy_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/XEIWhhH/mr_bullet_feeder_223_conversion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_603aaa4ca7be6.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/jgjjtfc/xikumowamaduzosadud.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/6jcjdtF/city_hot_wheels_racer_x_street_car.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/cancer_causing_factors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_b7809f5075174693baf7843c24ec832a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7de3dae-f1de-408d-91e2-84166047da50/54072902683.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/how_to_work_out_the_perimeter_of_compound_shapes.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_c1bbc3886d444ae0ab165e927fffbd37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5aa1aa9-df55-4267-b3b9-747d28f49b04/solving_quadratic_equations_by_factoring_worksheet_algebra_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/852e077f-19ab-4e29-aba1-c9070c23635a/what_is_rule_70_on_ncis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98d2afb-b9e9-49c4-9c36-4fef3e73e5d6/what_do_you_use_a_shaker_bottle_for.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_off0000d803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD803 5244 bytes
SHA-256: 734dcee2e2b0853f9ea3f7d66a42035924f76292775c17dab69261ce8d73800e
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 13036 bytes
SHA-256: 9375cda6a72e60ce2bf719cbb96318037f5597c95fb718a9324247b70439b01a

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