Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc730091b0b609b6…

MALICIOUS

PDF

48.5 KB Created: 2020-11-06 20:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1ac81e64d877645ac2a3471bdac438ac SHA-1: d8369cc0e249f7288df14d0459fb26bc8328f0d0 SHA-256: dc730091b0b609b66a22791bee3bd881d282822a8d12f150a8d053be9bf0f05b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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://traffking.ru/123?keyword=hate+list+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5fa09e9c46538.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/rarikavabemis_nadavutidur_nutalelodate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f97b8dd32fab.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/3885223.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/ce43470f1.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/d18561a.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/3240114.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/lotujepusus-kesutaxali-gexudesokepil.pdfIn PDF document text
    • https://fatumusuwenufok.weebly.com/uploads/1/3/4/5/134578353/wemison-sunabevuleteb.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/43a61cec-e081-40da-a13b-4f114a1d760f/85607084284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d8267e-6767-44a5-b093-e93cd28ae567/74638795897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28501e02-bb82-4760-84ca-cdc37e197093/22855267709.pdfIn PDF document text
    • https://guxedozepi.files.wordpress.com/2020/11/16861690022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87354d1f-a455-47e1-8163-ed5720590c91/bukadulikenenudukab.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d688a83f-e186-4d85-a4e1-98d1d7654f1c/download_i_spy_treasure_hunt_windows.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7599 4324 bytes
SHA-256: b25ea6e2b9b322af5be79bc3e70e2cdb41e6b6aee168d1264024c4941024bd96
font_01_sfnt_off00008446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 10608 bytes
SHA-256: 83b52444464e74c7e35badd68e38be0663ac77655c8e1f17e4e97cf7347f6de9
font_02_sfnt_off0000a6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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