Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8549f2004071dac…

MALICIOUS

PDF

104.4 KB Created: 2021-03-25 06:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2475b7dc9c259f5a660170350a8cd788 SHA-1: 964e42d660217e007d63c729526c9a4a94343c9a SHA-256: d8549f2004071daceadcecea20b40e29e8741182029c47503c2e9aff9f96f2a0
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 0.9998

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://lozipotod.ru/wix?keyword=platte+county+missouri+recorder+of+deeds PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_c2c111f5d53849ea9a42a163d4b07041.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/magic_seaweed_santa_cruz_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/41977157901.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_b5d8cc6867a94a88a0095c1d5ca60449.pdf?index=trueIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_bf8a50c28fc44facb5c3b9b1a5426981.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/mibenasazeverovorabeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b30d38-3f8f-44f8-9ad8-594f13c6e8b3/50155178016.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/sierra_gameking_223_load_data.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/vanadazoverawat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475f4470-ee29-452f-888f-0c96797aa6ae/wagebirabukepijar.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/jubokeveforowexubatojoz.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_1121edf5a12347be94592f33a67141ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/692beb1b-f8fa-4407-9b06-ee1786008500/sulumifekijanu.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/ielts_reading_test_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a5d50b-dcc3-4596-b211-37cf212512e5/black_and_white_portrait_photography_lighting_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/essentials_of_statistics_mario_f_triola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f576cf17-0539-4b50-914f-e3e4d9599f61/80190843181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985c5e5b-5d19-4079-aea9-1dd02d17e37d/71405529173.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/hadoop_the_definitive_guide_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd39bfa-69b3-428a-b442-a021c1d5b204/18885448851.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_off00015b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 5268 bytes
SHA-256: 203a6501965bd52b91ca83efb555585e3807786103e8b43a63ea251124f45f69
font_01_sfnt_off00016d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D5B 12060 bytes
SHA-256: ef5bc20e7cc788bee5042c20869bf2c9bf0e4e3accff868c5b72a677991291ab

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