Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76cfe67011ce029…

MALICIOUS

PDF

77.6 KB Created: 2021-03-20 21:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 63d811e3d0b37d25d0405bd5ece9f028 SHA-1: 5a5515b610e2e4ab4c390c32fd73e8c92f38a0fe SHA-256: a76cfe67011ce029caae877d3350c9616b1984f2af2ae2fd230880b817552ca5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dafemum.ru/strik?utm_term=funes+el+memorioso+resumen+el+rincon+del+vago PDF link annotation
    • https://zinebarovug.weebly.com/uploads/1/3/0/8/130814534/kilasogifolur.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/rilop.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/dc_generator_emf_equation.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/bikazojapesow_wenod_sukalajas_dexadi.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/pesap.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/1626386917.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/00906e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_53b0975f1dbb4147bcdb8763b14dad6c.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_e38e2246c734400b93bd4f6afa89e9bd.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_8d426e6f312f4daaadbd62f1c1d46554.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/ludumawasenaz.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_b4023e10552b4503b893d5f587bc8ae4.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_d50f55528a244e9ea11769937c19dcdf.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_1342bef3f7034f99ad02b844ee376f49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdadf7c-0d13-4201-a448-3eabe6c3cec4/why_does_my_fire_alarm_keep_beeping_at_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49edbaa-7c4c-4649-9127-78f2ac368808/47407290854.pdfIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_4a3460f599b346548be56aa1b48a2d59.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_ec4aaae6942640e494e6c933a187a36d.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5272 bytes
SHA-256: 7ce84d7791fc59e945bc5591593d9857aa589b8a2582b468e6a2da29ea0819ff
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 11760 bytes
SHA-256: 56bf7c400923775aca274795f8713000417ef079e1a8c890c0eef463bf41c2dc

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