Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77579cb1390343c…

MALICIOUS

PDF

86.8 KB Created: 2021-02-21 07:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6f244aa827ebd07bf02c858a3978e910 SHA-1: a730e01cfb967d350b9bf3c28d9df5f0e6065ad2 SHA-256: b77579cb1390343c9d25eff41b7ac804735a2800ffc379854d1b509c0d3b771d
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://yafferge.ru/wix?keyword=prentice+hall+writing+and+grammar+answer+key+grade+7'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'http://rodobokojezaga.epizy.com/la_times_sunday_puzzle_answers.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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=prentice+hall+writing+and+grammar+answer+key+grade+7 In PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/1747956.pdfIn PDF document text
    • http://tubujagowip.iblogger.org/pentateuco_pablo_hoff_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5ffade8fd256d.pdfIn PDF document text
    • https://liboresoxuno.weebly.com/uploads/1/3/1/6/131636570/ab33e2abbcaab3.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/jinalej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodobokojezaga.epizy.com/la_times_sunday_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/89852426288.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/cacee_form_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/tukipefasapazebedinuta.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/68070008938.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/votemovuweno.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/continuous_random_variable_example_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/57519130771.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/descriptive_adjectives_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/appellancy_without_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/zevajodekadifesavafudul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 4788 bytes
SHA-256: 7747374260654156b2d7960c698f6b6bf6e8c26e4530cab16f22b539ea264b1e
font_01_sfnt_off0001145b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145B 5692 bytes
SHA-256: 7f70a23a4878bb4f82b49fe758b72255a49be841222491bca0d0febd8716edd0
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 11080 bytes
SHA-256: a0fe0f752ac0ab3de38228360cb55ab1bd00fc48777867a6db1bafb49a50bb57