Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b0f1322797a3f6…

MALICIOUS

PDF

73.1 KB Created: 2021-05-09 21:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 68de66c7c07b36c99f88bd0a2f40a071 SHA-1: 8ccc006932c8077f5105f15b6fc604293971bc81 SHA-256: 70b0f1322797a3f60bb71faec92cb6eefc49997ea51fa83fe3be9738338191ef
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. One prominent URL, 'https://resalured.ru/strik?utm_term=fl+studio+os+x+free', appears to be a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=fl+studio+os+x+free PDF link annotation
    • http://taroburi.iblogger.org/49294151874.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/wastewater_management_system.pdfIn PDF document text
    • http://pelososone.22web.org/lingua_latina_per_se_illustrata_answer_key.pdfIn PDF document text
    • http://micrometer25bill.site/putes2i8qp.pdfIn PDF document text
    • http://woodbonus.net/piseterizudepipiduguuxmd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fff2e0d23325.pdfIn PDF document text
    • http://loxupuf.mygamesonline.org/telekodu.pdfIn PDF document text
    • http://giveaway2020.info/690211154249crj8.pdfIn PDF document text
    • http://papuleni.22web.org/insider_reporting_osc.pdfIn PDF document text
    • http://kieverts.xyz/lukemebojogerunezibureggrhbo.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/66271277885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_605bcc3b36541.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_6004336cc071f.pdfIn PDF document text
    • http://idealslimitaly-official.site/how_to_get_your_music_noticed3g7r0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadiripu.epizy.com/tissot_prs_516_user_manual.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_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 4716 bytes
SHA-256: be52a7aabc4ecfcfa8c10881f8b221ff8a5139be29189e6d70309856fd342d1d
font_01_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10456 bytes
SHA-256: a13cfecbf93a4e26ac52aea35bb6eb466766503952c71ab67750053b8a5be4ef