Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb2e2138ed098ae…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 22:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 98ad5154334e5559e38aa8f4e029776e SHA-1: 746c2face1f26fd13fa4113aa8696d30b7b2e458 SHA-256: 3fb2e2138ed098ae8f26d60cfec16a22fd9941723b592fb6acb0fb550c73a0c4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable or potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the link farm heuristics point towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://yafferge.ru/123?utm_term=manual+milk+bottle+filling+machine In PDF document text
    • https://cdn.sqhk.co/gawagunikuw/chg4DFp/90605034885.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/8633401.pdfIn PDF document text
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/3106798.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ggi2iiJ/escape_plans_prison_architect.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/4598637.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/jexitu.pdfIn PDF document text
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/jukuletek.pdfIn PDF document text
    • https://fimozovaxevaba.weebly.com/uploads/1/3/4/3/134366914/7333c6.pdfIn PDF document text
    • https://xobagosuwetir.weebly.com/uploads/1/3/2/6/132680986/nunuxize.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/1033806.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/954931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0878a30-c885-4efc-bbdc-e14660944f76/xuxozadoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e6f164-3f8e-4ae7-9df3-9ca6e81beb68/vefanaxumumonola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3444c1eb-479c-4eb6-9ad4-33f48eaab971/how_to_make_child_blow_nose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e209abb7-15c7-4dee-866d-8de36a53020f/2020_lexus_es_hybrid_gas_mileage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4324915a-9b46-4797-98d1-397839902897/6544947819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97765c20-3f0f-49fb-9256-3f1b3e7eb92d/how_to_uninstall_audio_drivers_and_reinstall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40eb355-7373-42c1-b772-e7b649decf0a/aluminum_nitride_ionic_or_covalent_compound.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_4520f2d935354031aef22359ad7be5cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20747143-96d5-4c0a-9848-6a9c370e84b3/citizen_eco-drive_skyhawk_blue_angels_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6550142-def9-4b80-bcff-792bac09f8b2/mugurowiguxed.pdfIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_6a3797c54b5a4dbfa14508681bb85e02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e436d66-ad0e-423a-abcd-09155872cf00/5948790620.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 5228 bytes
SHA-256: f3e6dcfc5819794ebd01975cc44289f8e67cbd93700cebd80cd9a8b4e42ac40e
font_01_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 10920 bytes
SHA-256: 1524ac5229ea7fa897fb6d063afa6afd2522a747379eefce463a6c90c864cdf9
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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