Malicious PDF — malware analysis report

Static analysis result for SHA-256 95939f08485ce3cb…

MALICIOUS

PDF

84.6 KB Created: 2021-05-08 23:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1f661ecac5d5c3660e586d157268b14c SHA-1: 9b9c10a818d3a2aff0249d181239acfc2b9bf4e6 SHA-256: 95939f08485ce3cb5d146315dda5692b2f330bf1069e6f2c438afa09686671b5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one suspicious URL pointing to a potentially malicious domain. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the structure suggests an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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=half+blood+prince+cast+age PDF link annotation
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/wuxebulemoketak-kemiziji-bifisomibow.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/tevekulukewud_lubajitobo_xozogopazuju.pdfIn PDF document text
    • https://zifudaxoxatoj.weebly.com/uploads/1/3/5/3/135313713/pojolobe.pdfIn PDF document text
    • http://predouche.xyz/jefedidamivosuwoteradpejl.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/lunux.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://fijudemi.weebly.com/uploads/1/3/4/4/134400988/wigar.pdfIn PDF document text
    • https://pejizaki.weebly.com/uploads/1/3/1/4/131437091/wokolixitominesu.pdfIn PDF document text
    • http://prizinsta365.website/balenemodubokajifexosl2qv2.pdfIn PDF document text
    • https://novazoneb.weebly.com/uploads/1/3/0/8/130814043/netusiterisilolemen.pdfIn PDF document text
    • http://natorg.fun/61132507437ml1eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_030d018c1a164880afa92089cec8edee.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_f7fd032515ac4085854d8087348a1892.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/651bf2f1-a0bb-4739-b8f2-afc11ed62fca/smart_wristband_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cdea71-5075-4679-8864-5da189c8dd47/cuando_mide_una_pulgada_en_cm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9f03db-fef2-4cae-9632-6035ec9a8064/how_to_resolve_conflict_in_the_classroom.pdfIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_d8c124a34e7c4bccb88c8c0fb8e70509.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87430743-065b-4973-a42d-5722954202ce/bergeys_ford_700_n_bethlehem_pike_ambler_pa_19002.pdfIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_87eca7ce0cab48209d78819730ffacb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/146125a3-6004-48f5-8b22-14df3bf8a428/2002_ford_f250_diesel_transmission_fluid_type.pdfIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_7601c742981448038c2e4b21e42de3bf.pdf?index=trueIn PDF document text
    • https://dd54f144-242a-4a88-9385-6c39f9996aab.filesusr.com/ugd/9f32c1_9496ab8ab69a4d7991f8ab7f97200d50.pdf?index=trueIn 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_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 5424 bytes
SHA-256: 73fd99e10a6ef2a71f158dc46f7137d0d42e8c83d3e3f37608af06e57700999e
font_01_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 12176 bytes
SHA-256: b0ea6938de63a508215a392de7d4f96492d537f013e05deb23810474966a6f4c

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