Malicious PDF — malware analysis report

Static analysis result for SHA-256 91309f6327c22ffc…

MALICIOUS

PDF

72.7 KB Created: 2021-02-05 16:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be242ef1cef844853e010e4050f8c601 SHA-1: 580239d42b48b4f45ed3003117633b62b1f7c065 SHA-256: 91309f6327c22ffc0fb24fdb604fac9b9dd429a08b541f1d19e42c54cd365300
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random URL links and being part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest maliciousness. The primary malicious URL identified is http://privateguardingserviceagainstdanger.site/marvel_encyclopedia_2017_free_downloow7w3.pdf, which is likely a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://maypoin.ru/123?utm_term=yamaha+rx-v373+specs PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/1794241.pdfIn PDF document text
    • http://lazerepil.site/27959621769gcml6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd773ae8c921.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/marvel_encyclopedia_2017_free_downloow7w3.pdfIn PDF document text
    • http://titonevaj.22web.org/29949499340.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/pozaxo.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/1102973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_6000b2888b7df.pdfIn PDF document text
    • http://com-copyrighit.com/tijorafarodezeji8qifl.pdfIn PDF document text
    • http://vamoktin.ru/gimivovigogowupi0qqp4.pdfIn PDF document text
    • http://volosaty100.xyz/7540057667101ec0.pdfIn PDF document text
    • https://sunanineriputa.weebly.com/uploads/1/3/2/7/132740954/fusino-sexovalurelat-rigowezunirobu-xudojuruf.pdfIn PDF document text
    • http://delaem-sami.online/pathological_demand_avoidance_symptoms_but_not_a_syndromesjali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_5ff8ce30b5e47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/wotuba.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/ruwodefinipex.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/72573948172.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/guntersville_frog_fishing_report.pdfIn PDF document text
    • http://pevoxino.epizy.com/27644888506.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/spotify_tracks_to_pc.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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 5508 bytes
SHA-256: a65c2ee1fad30ebf480cc085574ad05910a999d8a27936346c02b5d9cb8202f1
font_01_sfnt_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10056 bytes
SHA-256: 4c456e6024eabb9bb0c271527aee3f17295dd9c1d9ac2ee4957bf1c46ca76487

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