Malicious PDF — malware analysis report

Static analysis result for SHA-256 1147d10b2f90cfe5…

MALICIOUS

PDF

76.0 KB Created: 2020-11-09 05:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9280d9efcb1e4cc453e13ee9ddb64e86 SHA-1: 9f025969cdeef4980fc05d3dd322a679c0c295bd SHA-256: 1147d10b2f90cfe52bbd2570e2e8efe257f491386008237add0f25ba564b332f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a potential link farm. One prominent URL, 'https://traffset.ru/123?keyword=ruger+mark+iv+raffir+hunter+talo+edition', is embedded within the document body, suggesting an attempt to direct users to a malicious or spam-related website. The ML classifier also strongly indicated maliciousness.

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://traffset.ru/123?keyword=ruger+mark+iv+raffir+hunter+talo+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f9ea74f44ba4.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/konariporaxamek_kibelodeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fa8ac0e40b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_5f9d2e62af721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f974b6c5b540.pdfIn PDF document text
    • https://xidonojozam.weebly.com/uploads/1/3/4/4/134498592/1193423.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/bb2ec8c3-1caa-4479-ba8f-686af9af0f66/piratebay_list_proxy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4287a9ef-4436-4534-b33d-0af4a15482d6/7602596430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe3fd0a-93a6-4ebd-ac66-fae3ed0456b6/74698891481.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/multistage_centrifugal_pump_experiment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13d0232-8e34-4e20-b8cb-6bcaf27ae5fd/zogokimoligovabinisiku.pdfIn PDF document text
    • https://zudulobaf.files.wordpress.com/2020/11/multivariate_data_analysis_7th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df9c0dc-507c-4df2-810b-46744cf5a7c3/84941726236.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/developing_clinical_trial_protocol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e067c9ce-2c8b-4e41-8d5e-83df39ad2ba1/32603547701.pdfIn PDF document text
    • https://bajalafel.files.wordpress.com/2020/11/79306309645.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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5276 bytes
SHA-256: 9f6493e5d9d70025661de5e3c47898295b7fa88900fefc96b2e6c889714693e5
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 10352 bytes
SHA-256: 4c4da7dc92e9b532e69baf468e9a51b50e08e5765234cf0d25a1a1c2ba341b34

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