Malicious PDF — malware analysis report

Static analysis result for SHA-256 735b63bceb31a0e6…

MALICIOUS

PDF

79.3 KB Created: 2021-04-04 15:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 846481ba374c05eef39ea9c91a663243 SHA-1: 29f19390c036d7f93738a6ed4aae7df88b505314 SHA-256: 735b63bceb31a0e62157d8bdf1f3444a91d9bd29653c6b6551f25b924e8f4498
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a potential phishing or malware distribution URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or create a link farm. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=laserjet+m1217nfw+mfp+airprint
    • https://riregagofowa.weebly.com/uploads/1/3/1/3/131379776/c3203c0.pdf
    • https://xepesosagar.weebly.com/uploads/1/3/4/7/134737956/fajadedemuwoz.pdf
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/ccf9c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_ae476e004a5a458897c8930b3292462a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d40906c-08bf-4e49-bcfd-3618ee55238f/haier_12000_btu_portable_air_conditioner_manual.pdf
    • https://uploads.strikinglycdn.com/files/68caedc9-a634-4603-a9bd-e4bc6121d7bc/movie_maker_windows_10_gratis.pdf
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_fadf19aa3cad47e687caa76330b384fb.pdf?index=true
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_90a375d1d9ea48a4ab5767b80e6484ef.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_fe1b6f471c034751b609d6a7033da3ea.pdf?index=true
    • https://a9b72ff8-ed6f-4212-96c6-d467cc4e2332.filesusr.com/ugd/7f5649_d5798121aa314311a8ea404ad41388f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0fb68286-6268-4f96-8a1a-2ad1fd46ec7b/tv_makes_clicking_noise_but_wont_turn_on.pdf
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_566c5f0951c34e099ab8c7a0e21e81e2.pdf?index=true
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_781fb49fe85b4175bbc92dead4a4dc53.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_4a666d6080504cfa9e518daec57104a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/353b27d7-540b-482b-931b-f23a71e69eda/bostitch_rn46-1_3_4_to_1-3_4_coil_roofing_nailer_black__yellow.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_d7e29cec38234b12ad05cc5531a29976.pdf?index=true
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_ffe102a0ae944e52819fb2d6526cef33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab003c20-5b54-4c67-b325-0857a40bfe9f/en_el_nombre_de_la_rosa_online_espaol_latino.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_d39fb46f630449f29ab374c921ac51b6.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_03cbc66221ee4176acc0257c3bbcbe20.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_4617d98469384f549e33f6eb778628a1.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_9d42c6bb268641038841a41e4237a3f9.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_off0000f54e.bin
fe6ff34ecd03b83a794ebd3cd0a3f3e6d1746123d531912315e25cf3137af823		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 5388 bytes
font_01_sfnt_off000107b1.bin
8e7e804d5edd3f67b45c72342a3b8f8f4b1a20000e570ecd78e858ec901fa79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 11856 bytes

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