Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c72977eac95ad6…

MALICIOUS

PDF

71.0 KB Created: 2021-01-28 21:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 726b9e74eb238d1777d9db4fbfd0e161 SHA-1: 7e55f245bb2f824ad02ac79ac9b31125e66f3678 SHA-256: 11c72977eac95ad654968cc13f850714687d02803c439b3b541af823d166d001
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms designed to obscure malicious destinations. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The presence of numerous PDF links and the ML classifier's high confidence score indicate a deliberate attempt to distribute malicious content or phish users.

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
  • 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://crophysi.ru/123?utm_term=analytical+mechanics+fowles+6th+edition+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5ff5570d24903.pdfIn PDF document text
    • http://ighelperscenter.com/225713818053aypl.pdfIn PDF document text
    • http://metalllift.ru/dopowenopakigofesudufurizo4o4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fd07ab746660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_600be51b3acc5.pdfIn PDF document text
    • https://deluwibenarut.weebly.com/uploads/1/3/1/3/131382693/3131468.pdfIn PDF document text
    • http://kefets.xyz/need_for_speed_no_limits_hack_apk_data4tvr3.pdfIn PDF document text
    • http://white-x.fun/global_war_on_terrorism_service_medal_veterans_preference97add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506200/normal_60037b1a04e18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_6008c9f02be4d.pdfIn PDF document text
    • http://begdas.fun/godegapenob1fo0j.pdfIn PDF document text
    • http://liketime.online/39566140532vm3y8.pdfIn PDF document text
    • https://jikumuwalomaj.weebly.com/uploads/1/3/1/3/131383204/fijabolejimigunemafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://godavuvexo.epizy.com/dolch_sight_words_printable_worksheets.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_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 5424 bytes
SHA-256: adce83da78f09b63a5d1b37b245d3720c2f4274181dd24ee2b3d093cb5a520d2
font_01_sfnt_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 10372 bytes
SHA-256: 4a9ba100b8504848d1ccb75b7ab66ee23d93cbe22eecdfe3299207af8ef10432
font_02_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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