Malicious PDF — malware analysis report

Static analysis result for SHA-256 b133cbfe44e311ab…

MALICIOUS

PDF

81.6 KB Created: 2021-02-19 16:05:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1afc712e0411376ea72e973acc778f5e SHA-1: a1c6fa3b371b14f6875b083a01fbd2efc90a202f SHA-256: b133cbfe44e311abc0bc7c64e155f4131aca2116ccc8a93e7d4e5e282cce27f1
254 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=jane+eyre+victorian+period+important+events In PDF document text
    • https://cdn.sqhk.co/lafuwexale/jWjekje/muxon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5fda945f73226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fc57f9a7d7f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/Z3SBgji/unicorn_photo_shoot_dresses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6020871b45a37.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/Hibttig/88551556188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_6028b8ae94bfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_601c6ba9ae6dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5fd04f29890b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404753/normal_5fdc6f3316a68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_602f38808bf25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe6b268273bc.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/baRjjjg/super_mario_run_full_game_apk_android.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/lovilupozuzax_vuruxitu.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/sebunuzu/ts_challan_entry_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/how_do_you_open_a_graco_double_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/an_inspector_calls_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/24700346048.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_off000103eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 5336 bytes
SHA-256: 31d852736785331ba2fae59cf1e8a0d7549fb801a2984f055c992c25ca91ce41
font_01_sfnt_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 10240 bytes
SHA-256: cd5685dd0c354d74d16ab369c8eb95b83f3450925c2711b8075089025b656ae1