Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb34f65fda26a1d…

MALICIOUS

PDF

79.6 KB Created: 2021-04-15 02:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d27a65d576db491f9d32509a089a15 SHA-1: eb9e15e6fa197f1a2ad9fa8188e2a0717dee4bf9 SHA-256: 0fb34f65fda26a1d91616f8f6ec51fb3b8b162f31fe8b4b29c48df7f9333da51
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=what+is+the+most+unusual+name
    • https://cdn.sqhk.co/letareximo/Fxgejhd/real_car_driving_experience_hack_mod_apk_download.pdf
    • https://cdn.sqhk.co/wifuponi/ifjeiej/history_of_africa_bbc_2019.pdf
    • https://cdn.sqhk.co/nikamegamu/eidid8W/cocoon_bed_sheets.pdf
    • https://cdn.sqhk.co/bunigenozav/ahcejid/polezulesovalelusez.pdf
    • https://domenadonasi.weebly.com/uploads/1/3/0/8/130874365/sepukawosujam.pdf
    • https://cdn.sqhk.co/fidumugovoz/giCEhgz/tank_battle_1944_review.pdf
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/fulirotofumeviguri.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/solepolinazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_cf95ba1068324f84a8d31e26a86acdeb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db9a03aa-a19a-4b46-bfa8-246f5dcfeb47/sogozofegevuromorosuru.pdf
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_caa0ae2bb2e3460a800087cc9603df9b.pdf?index=true
    • https://2a04f01a-7147-4793-98aa-b59dc93e6f96.filesusr.com/ugd/efcdeb_44b6d70a4a5e4d6f88730329ce4cde23.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_7d16fc2ec9594b458a999a366bede832.pdf?index=true
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_521b2618d2b54c7893263554ed131f9e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c1d43eb-7972-4160-b4b4-2ca55deec0bd/how_do_i_find_my_local_post_office.pdf
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_d76f16db11624e83aef407ece8da826a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a64ec641-0bdd-49fd-8f68-542d9c8e6e54/oily_hair_shampoo_solutions.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_92a9d2504dbe44c8bce7ca7a08ce8d6a.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_056a7885d70b47b492ce454a306d501d.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_00e0cc57191e4d2494b73bb447aa915a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa5607c9-53cb-478e-9352-fd8ea6a98a2a/guzikuramasoweg.pdf
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_06a47ee9a97c4dc791886735bfa98a31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4fd6220b-bbea-43b9-a87b-d30cdc8b4a62/big_faceless_java_library.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_d643f436de534324ad1e059f25e38859.pdf?index=true
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_2a4b0dbec8e34ecb849cd8e7e5d5a025.pdf?index=true
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_80e61e5f235c4199b4f90db50a89fcf2.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_6e520a937b114db8a2033c76d538eca6.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_off0000fb88.bin
a2ace479f609644750aa4ea075ec5ef78f485f20cef2a40b5b4740aba16eae52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 4840 bytes
font_01_sfnt_off00010be4.bin
c0b68b8cdf23564861daf25d53bcbfac714bd7cb414352163583d47b52ad43f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 10868 bytes

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