Malicious PDF — malware analysis report

Static analysis result for SHA-256 677c5bfd2d48dfc1…

MALICIOUS

PDF

41.9 KB Created: 2020-11-09 10:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5b1a40ee0ef2f24a930be5a97aa2181c SHA-1: 97a13b3a9d54972f422aed678a633830526cdc29 SHA-256: 677c5bfd2d48dfc145a4b0302fa6c16d89c51796f9dbdf8e19df92cbe5d00afd
96 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 4

  • 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://trafficel.ru/123?keyword=weekly+schedule+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f93e45f466ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5fa2e8741ae08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fa15e2ae868b.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/xilanivod_roginenif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fa0dca8ce4f8.pdfIn PDF document text
    • https://livozuduk.weebly.com/uploads/1/3/4/5/134583284/vovopozam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5fa6fe654f783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5fa2c23f4189f.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/c6a96317-ca3b-4402-9a20-42f3d6e87597/82328679168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42bd566a-7dae-462b-9f5b-df076462e82e/komubafado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e49a2f-64a5-4390-85c1-15286af714b4/71451485485.pdfIn PDF document text
    • https://pufelaneniw.files.wordpress.com/2020/11/95221410305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2f76d2-24d9-42db-b71c-30001a88a616/hack_asphalt_8_pc_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2bdd2e-05c4-405c-bfb3-47a0a29aeb05/the_amazing_spider_man_2_game_download_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec6c699-fe27-402a-8403-cef196f8ae4a/49092504803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f278326-0250-4fad-996d-ed49f81430bd/82705436487.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_off0000643c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643C 5396 bytes
SHA-256: d48ee8e717c846a54d7adc4236c0657d924fb935c7e2a20f6957466a8d3cc3fb
font_01_sfnt_off00007689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7689 10860 bytes
SHA-256: 1b69c7857e1bea8c9acb4bf18d55d9e8ce7f4a3f7f06c6befc1337a8e5a8eb92

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