Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48a04e9e7fd014e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-05 18:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bcd1b05b1eae6ef6cfaabc16f3531705 SHA-1: 5964f933c7562e8b998b4f81e62698270d0ae17c SHA-256: e48a04e9e7fd014e6947dcf31f61da2bf46f626c8286575c4666c366f6d7c50f
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 0.9998

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
  • 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/wix?keyword=boston+acoustics+ba745+computer+speakers+manual PDF link annotation
    • https://cdn.sqhk.co/dewufidabo/zYZDUgh/technology_teacher_certification_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/jhheCjj/susunisem.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/awifMP5/dufadosazeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_60338106a67af.pdfIn PDF document text
    • https://cdn.sqhk.co/kerodamajop/cgcXjia/12887411186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_6003e2941ce54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5ff3ccb386fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6022ced88697c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_6009b7f737848.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/fhijieE/origami_star_easy_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dce29e8d-cd86-4c13-8a86-714db8c45981/15718798519.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_c119f1ef40904b9683ebf6b9fa098bd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50eeb4d-233e-4069-a38b-527fcf44733e/32622897203.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_0fc2607b388b47eaaa6cc201f97b8280.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_7395886334e7411b996c8096fccd76c1.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_2c12acb9ff6f4b91ae16a38a750222c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78393609-7ce7-4d3a-aadf-b51aea6995af/nulegaxivojirirajuzo.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_753f4f70267b4495ae5004a4f02d48be.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 5504 bytes
SHA-256: 4591eead253329d5b9525d991bc2b54a989e530e83695fc597aac0af53efa011
font_01_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 10544 bytes
SHA-256: bd5600a6fd919c3462d9231709b380b8d96b8e6341dad792c1273203c563f489
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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