Malicious PDF — malware analysis report

Static analysis result for SHA-256 483cc500e954d6fd…

MALICIOUS

PDF

58.4 KB Created: 2020-12-19 16:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad5631a09f71390446cffaee1a523b50 SHA-1: a2b195a0db2ebd40d988347ced20a87a509158fc SHA-256: 483cc500e954d6fd8832c06879e90efe26e64998eb2cfcbc0b0987f8230e4b23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://trafftec.ru/aws?utm_term=access+2010+tutorial+pdf, is flagged as unknown reputation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure points towards a link farm or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://trafftec.ru/aws?utm_term=access+2010+tutorial+pdf PDF link annotation
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/77c769a.pdfIn PDF document text
    • https://murenazomof.weebly.com/uploads/1/3/4/0/134012525/688925c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409123/normal_5f95b27961729.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/b4986216-e42e-43d1-a774-4311949835c0/ruxunizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5616896-3d8d-4fd1-9244-2504ec517f43/21271525977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2cb1e6-4ff6-4760-9784-ce7bdda9fab9/nikon_coolpix_l310_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b516d2-ee00-46c7-bd5e-889805ee77e9/xozomarirepapomuladutite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c88eb8-a3d9-4b32-9b36-5843753b4367/zepiwuvujobefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf060d08-de1e-4393-96cf-8b783625c25b/22529791616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e130e2-3b8f-43b5-9792-17d6d720c824/essentials_of_pathophysiology_4th_edition_test_bank_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e830e841-2239-48d0-b823-84ea0fed10ac/palmetto_health_citrix_access.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a73ba34-9bf2-4b7c-a7ea-86a15a24bf02/59046342162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23fa942-5dce-4b92-9e5c-3a065a6abe26/22676614042.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D1 5464 bytes
SHA-256: 26ac77e1c6e1f7fdcf9d0890a6cc3e3b3b8514d02ac4cdaa1ee4ee2a0516596a
font_01_sfnt_off0000bc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC82 9968 bytes
SHA-256: 39d9d32b92ffbeb39b92824d72f5ee9c98d6a915454591a41ad8baa25e5c5038

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