Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cedb1f3a7e5118…

MALICIOUS

PDF

73.0 KB Created: 2021-02-23 07:38:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d661941adf6732228b1d3d574f0d1f9a SHA-1: 9cc3a9f5193e68483ad30384697080009151cfdc SHA-256: b9cedb1f3a7e5118532c871fbc1c0757b7b495f3349f88441bb4978a76ab0bcd
244 Risk Score

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
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=volume+by+water+displacement+answer+key In PDF document text
    • http://swiss-gear.store/descriptive_essay_sampleccnha.pdfIn PDF document text
    • http://help-ruleviolation.com/tarukeravaz27hl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_602c4ff3e760a.pdfIn PDF document text
    • http://autoport76.online/mijozegomakotifafuputujiujb7a.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/xakudonolu-biwub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_6023826b76828.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/cjfgcif/tezixoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/gixeruxa/jiiehd3/56988333457.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/multiplication_tables_worksheets_homeschool.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/jcGggf3/25459236481.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/ibjjicV/marble_chess_set_near_me.pdfIn PDF document text
    • http://ru-payment.casa/bisigazedh6twg.pdfIn PDF document text
    • https://cdn.sqhk.co/sarafogu/gflYPDy/secret_of_mana_remake_ps4_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzusegipo.rf.gd/15355141511.pdfIn PDF document text
    • http://gewekerob.epizy.com/sample_of_employee_bio_data_form.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_off0000e049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 5584 bytes
SHA-256: 87994e6b28b0f87bff3305162024906bacb6d654d42d0d4ec42b990267ebdca7
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10292 bytes
SHA-256: 368f2439f484284c1888d29569da89bcddcd12b9d65be2eb5d53e022f44689ea