Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b3c1995b7c32c2…

MALICIOUS

PDF

95.7 KB Created: 2021-03-17 18:03:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ad8d8ad8814977c160cde5a46e396f SHA-1: ecf40ae21bd80219da80b74e444714a378e65cbf SHA-256: e5b3c1995b7c32c2398b1fedac667e19462865a5d7cdd4c5b13f0d7a0c8ab32b
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://druttle.ru/wix?keyword=physics+for+scientists+and+engineers+giancoli+pdf
    • http://max-lifting.store/zixogigoxuwujusejuvjnfhz.pdf
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/bebeworoduji_tuxenavidiwono_razadisup_xedijupefow.pdf
    • http://muldwych.com/61765842588tzo29.pdf
    • http://naturfresh.space/circle_theorems_calculatorftam5.pdf
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/5904663.pdf
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/8939095.pdf
    • http://fb-ig-copyright.com/old_arcade_game_downloadrx44l.pdf
    • http://porn77.design/what_is_direct_rule_system0dgao.pdf
    • https://pelazokud.weebly.com/uploads/1/3/0/7/130775509/nozixigofax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bf033a0d-03b9-4baf-87a6-cc2dd150c242/kalefutijuvafogefu.pdf
    • https://uploads.strikinglycdn.com/files/8ebc6c36-b4d9-4e74-be0c-702c2e93e7e7/far_from_the_tree_documentary_summary.pdf
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_91b2c505891849e39578a6b91ccc6a59.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_a541557ca52c4d799757f931ee1d2e47.pdf?index=true
    • https://s3.amazonaws.com/wefemabeni/muwul.pdf
    • https://s3.amazonaws.com/mukut/9178663715.pdf
    • https://s3.amazonaws.com/tinezedu/rakavatekir.pdf
    • https://s3.amazonaws.com/puretulenuza/sasizera.pdf
    • https://s3.amazonaws.com/juvetaso/cartoon_normal_font_free.pdf
    • https://s3.amazonaws.com/lixuzo/hieroglyphic_dictionary_petty.pdf
    • https://s3.amazonaws.com/zarusegibitumet/63987602655.pdf
    • https://uploads.strikinglycdn.com/files/3a605f97-b7a1-43b1-a4c7-8093fd98e10a/which_country_has_highest_economic_growth.pdf
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_2cc5b99f6e764462abfb8a715a8bc048.pdf?index=true
    • https://s3.amazonaws.com/tobito/suxesijureguz.pdf
    • https://uploads.strikinglycdn.com/files/e29d2df5-fd92-414b-b403-eea8accfe48e/dexeledowapijiwafon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ae2.bin
9f4a41a73bcaaf943d6d61fa746670783b02fc3015e505576d5ca6f115a6e9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 5308 bytes
font_01_sfnt_off00013cdf.bin
7a411da79a3765e5756872e34650f1fcd9e04fd4c374ac44192dc00fe175bb14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 11076 bytes
font_02_sfnt_off000162b0.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162B0 4324 bytes

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