Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81dd440413f00a6…

MALICIOUS

PDF

44.6 KB Created: 2020-11-09 10:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: daabe607e4a459c7479bb22c432c709c SHA-1: 8c1d3924ce91a7d14bca335b2f6645929630cca4 SHA-256: f81dd440413f00a6a9709ef20d2dd287ee9dc3d27677b9c34f11fdb730a5edec
126 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 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 1.0000

Heuristics 5

  • 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://traffine.ru/aws?keyword=what+is+a+it-201+tax+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5fa34abbe5bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fa8859110576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fa2ed68e2aad.pdfIn PDF document text
    • https://pixipesigogod.weebly.com/uploads/1/3/4/3/134370637/sapitalekinif.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/fekawetodobuvaw-pulovub-bekexuxovasil.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/patabepogi-denuwamalutez.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/5269681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5fa71414bdcad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_5fa8abbf799f7.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/44c2eafb-b3fc-45be-b6d2-944c6c9e5bd4/shards_of_honor_summary.pdfIn PDF document text
    • https://vexuxab.files.wordpress.com/2020/11/steven_universe_attack_the_light_apk_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ab7197-4172-4a72-855e-925ccb3367b2/89082189149.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ffff266-cfe3-4980-a471-c6509c8f0dd6/fibopafi.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_off00006efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFC 5412 bytes
SHA-256: 5ba6d17364a6bc541d43bd9081ec65f83b66ef651c7ec29f3f1d80eb98e0c67c
font_01_sfnt_off0000815a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 10596 bytes
SHA-256: 8c131489920a72ebdf298da3073a4b53a18f79ef380cb48a8b72afc9cf1b2bec

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