Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dda228c792faa2…

MALICIOUS

PDF

89.4 KB Created: 2021-04-14 09:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0061f3b3b2270b07fa5cc62836230c6e SHA-1: e1f7fef1ab90dbf34eeb53431563e0c76a04144e SHA-256: 39dda228c792faa25041de8865defaa4aaeb56529996735aa024082a169e6a85
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, suggesting a link farm designed to distribute malware or lead to phishing sites. The presence of a 'download button' lure further supports this. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=graphic+designer+cv+templates In PDF document text
    • http://boothattendant.com/jodetavovo6e1.pdfIn PDF document text
    • http://phillipen.online/dietary_guidelines_for_trans_fatq15mv.pdfIn PDF document text
    • http://shimano-stradic.ru/how_to_repair_home_ac_unitope3h.pdfIn PDF document text
    • http://snatural.space/4817817201kt4kr.pdfIn PDF document text
    • https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/texidovizo-lipamosubero-kijapon-bugaporese.pdfIn PDF document text
    • https://bodukomemewasug.weebly.com/uploads/1/3/4/7/134701633/10fc67.pdfIn PDF document text
    • http://zogasukod.22web.org/9293076015.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/9df0ce.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/6eed28b5f7b9cc1.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/3899828.pdfIn PDF document text
    • https://giwegedunidex.weebly.com/uploads/1/3/4/7/134701534/388cd746c14.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/sefozujisabovakam.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/jakmjia/vonelikigerux.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/HHhaxcN/marco_polo_pizza_number.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/oicXER1/fivatapotat.pdfIn PDF document text
    • https://zupabigawobal.weebly.com/uploads/1/3/4/3/134326688/b460e555fb40.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/wjhjgeD/digi_clock_widget_plus_apk_full.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/FBifjcq/gmail_logo_vector_black_and_white.pdfIn PDF document text
    • https://xipuruvu.weebly.com/uploads/1/3/4/6/134654852/eff95b31.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/ha7gegh/u_miami_tuition_and_fees.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://wadekazu.epizy.com/merge_files_into_one_online.pdfIn PDF document text
    • http://lipidojomodu.rf.gd/53823882955.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_off0001145e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145E 5256 bytes
SHA-256: a1ce62b3d11139ed46b8a662da9312c94b8c2c3b3dc11d7a7ba1c0133a951a67
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 10568 bytes
SHA-256: c291d74c0343629c4efc2f4cdfed6637c7c35d81d7f0926e93012bb6cfd9762a
font_02_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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