Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c14fe34173e5af…

MALICIOUS

PDF

91.0 KB Created: 2021-03-13 18:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a77afdbb549b405a7161d7e19f2b0ca5 SHA-1: ace748ae9585d9db2641d418c93339edcf70f1d7 SHA-256: 31c14fe34173e5afa011d16f9d8a0ccecf1de36b7cc77667557b0afdff7ea35a
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to watching a movie online. The ML classifier strongly indicates maliciousness, and the presence of a large number of external links points towards a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=journey+to+the+west+the+demons+strike+back+full+movie+in+hindi+online+watch
    • https://cdn.sqhk.co/petebeki/j7sjdLc/dewagifuwarajufoguvovezu.pdf
    • https://cdn.sqhk.co/ferudati/Tiajaii/best_free_meme_maker_app.pdf
    • http://riniwodifole.medianewsonline.com/luliladigesiwolexite.pdf
    • https://cdn.sqhk.co/zofizitene/ibhghd7/bracelet_apple_watch_series_3.pdf
    • https://cdn.sqhk.co/difixoruze/ifghjgk/hive_blockchain_stock_forecast.pdf
    • https://cdn.sqhk.co/kinibemazoz/ejbghgq/fitbit_inspire_2_bands_australia.pdf
    • https://cdn.sqhk.co/nebafori/efE2ghj/raterudelodakas.pdf
    • http://xuzotudaraderuf.mypressonline.com/boron_health_benefits.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_6049c3057a674bb99b6c30b6c5b035f2.pdf?index=true
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_e6258d8e413d42aaaacbc19103fa8160.pdf?index=true
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_c64396c624ab4540bcb82c986c0a8c6d.pdf?index=true
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_eedc19581e554d55aa9693c218379ef4.pdf?index=true
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_45698bbac2d9457b8eecadb1e10f1628.pdf?index=true
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_48cb4b1d7f3340f1a79e74b31b16426d.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_33687e02f73e4ff3a1840a69ee27d0f2.pdf?index=true
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_c90940c447e64ce49615fa07d6910d0e.pdf?index=true
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_5a9fa196f4d5492eb53d70876d69f94d.pdf?index=true
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_940f53ca5e3b4f2e890668869c27cac5.pdf?index=true
    • http://davinawoguzag.atwebpages.com/samsung_xpress_c480fw_reset.pdf
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_2edaa89d1450407fa6a43a1e35ae9ad9.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_dc2ebcff47f044fcbcd8e176dbdf8048.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012595.bin
7830700c12110b1bb193bf8bd3d1471ab5a703a58d9f49625d94af50e9b5c5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 5708 bytes
font_01_sfnt_off000138f9.bin
a5e92a5c8cd42c22bffc3d6a945fdedec1f0d9b476166522b0a6d2d725fa2673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138F9 10772 bytes

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