Malicious PDF — malware analysis report

Static analysis result for SHA-256 df85785772f649c3…

MALICIOUS

PDF

69.5 KB Created: 2021-01-03 03:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fc6f858d25833699f5741445c88ab83a SHA-1: 18ffff385ec3c38b705b794f374e325381b8c57d SHA-256: df85785772f649c3117fd57cc33f9f1d93422376dfa2c19e2dab99dc06097fd4
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, a technique often used in link farms to obscure malicious destinations and potentially distribute malware. The presence of a 'download button' heuristic further supports the intent to trick users into downloading files. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/123?utm_term=movie+hd+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fa86c82c611c.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/tiladejonu.pdfIn PDF document text
    • https://tisolalaw.weebly.com/uploads/1/3/0/8/130814234/7e59da1b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/9rjivie/golden_computer_center_hong_kong_sham_shui_po.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5fa01a5759fc1.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/Xo0XbK2/28384815046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5fcd2ffd12481.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/adeaa40e-1fa6-4455-bcfb-3e6558c02860/detention_center_vs_jail.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51353e32-5da5-4ebf-a953-01dc975e3db4/82603074840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf610c00-f3bf-4234-b737-8c3598f60e3c/green_thumb_impulse_sprinkler_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9b752f-79b6-4c90-b0f6-95bee2553def/asa_flight_planner_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164340df-a962-4595-93cc-25794b64ec38/89801688107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3c3d52-dbd9-49a5-81e3-f7bad1085ce6/mumawafubexemizakumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ab677a-c242-482a-a84a-8debc36bb709/union_labor_wages_illinois.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_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 4996 bytes
SHA-256: 57aaf84b20fa693347d298ea6d2767e851c29ece86866b8dffb39e43c5a3d264
font_01_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10212 bytes
SHA-256: 3200b026e182f604147546aee30ce91e73f6e08c3b49c503253fa1d8078cbddf

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