Malicious PDF — malware analysis report

Static analysis result for SHA-256 de97485a80d0e658…

MALICIOUS

PDF

94.7 KB Created: 2021-05-16 18:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0e5acbee7e698725a5c7f7393ea3759f SHA-1: d72934f350ccc997b0309dfec34d5654ff1b3567 SHA-256: de97485a80d0e65824afaef147c9c7677a8f6750d917b6f919850947dd4902ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to enabling a feature in Excel, which could be a lure. No scripts were extracted, but the presence of external URIs and the overall heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+to+enable+power+query+tab+in+excel+2013 PDF link annotation
    • http://jakivuxevova.22web.org/asus_rp-ac68u_reset_button.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/dugudima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_60210fe724853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_6013e47e8d186.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/baroque_guitar_plans.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/podajomoriduwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60209b0a655f0.pdfIn PDF document text
    • http://jukejed.mypressonline.com/37741833907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/monster_illuminessence_led_strip_mood_light_kit_instructions.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_8dd88d749f844a8f805b6d77480f441c.pdf?index=trueIn PDF document text
    • http://bidajalej.onlinewebshop.net/gumewujenixegusikuzokuxaw.pdfIn PDF document text
    • https://869e45c2-9c2d-410b-ad52-4d3411d41339.filesusr.com/ugd/73bd41_0044a7892d104582be3e38f90a59a743.pdf?index=trueIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_94448d044a39489d9400d0ba68c4c76b.pdf?index=trueIn PDF document text
    • http://pavabiza.atwebpages.com/mrutunjay_marathi_kadambari_download.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/gabefewitisolemonanefaka.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_b7dbf4ddb4924cba94afd91dbf272b9b.pdf?index=trueIn PDF document text
    • http://jafutalamisa.rf.gd/sample_introduction_for_monthly_accomplishment_report.pdfIn PDF document text
    • http://wutorokanotomav.onlinewebshop.net/60829995828.pdfIn PDF document text
    • http://jujobope.atwebpages.com/78927147760.pdfIn PDF document text
    • http://wegorabeg.atwebpages.com/jobokin.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_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 5728 bytes
SHA-256: 838306c26b5b4a5d5bdbe3aa0ac78e1c0790d275830f62505f39cf8259c08605
font_01_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 10860 bytes
SHA-256: 7a751c0eb07440a421e339948ea64659a59d7104ba68dfed108813500bfcf651

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