Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf66d3f0b59af73…

MALICIOUS

PDF

78.4 KB Created: 2021-02-28 09:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e56a19b247c2ceeb078ae4f4e33ee48 SHA-1: fc89a11d3d3996c0a2f8be3957dcfea46b1af52c SHA-256: acf66d3f0b59af73bdc104f6eee26a05c2864b0cb6fe2ff3689fdf921407a1d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly indicate a malicious intent to lead the user to harmful content.

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
  • 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://zajinet.ru/strik?utm_term=catching+fire+suzanne+collins+pdf PDF link annotation
    • http://kupelobivinix.22web.org/integral_calculus_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_6027ce000e082.pdfIn PDF document text
    • http://dujaliz.iblogger.org/48070457732.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/can_you_put_two_hotels_in_monopoly.pdfIn PDF document text
    • http://wakogapenubez.22web.org/najadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ff0d2e61633d.pdfIn PDF document text
    • http://sapazukuwujoji.22web.org/81129029407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6017033b50164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_600b0e7960b57.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/79465824926.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/what_does_blood_in_toilet_bowl_look_like.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/kovilowab/fortnite_season_8_week_9_challenges_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/computer_terms_full_form.pdfIn PDF document text
    • http://jibaberumakome.rf.gd/nudat.pdfIn PDF document text
    • http://jopimuriwunewok.epizy.com/49178582580.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/28477437669.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_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 5372 bytes
SHA-256: b63571038fafde64252f1dab25858b9f2405a9afc9a65f0f579bafff440dc237
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10276 bytes
SHA-256: 3d3becf04fdf93a43ccabe5304656f6ec3b413311af70c88869a807e034d8550

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