Malicious PDF — malware analysis report

Static analysis result for SHA-256 74dc4276e97bdedc…

MALICIOUS

PDF

94.2 KB Created: 2021-03-24 21:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9055089b465c04341aac916877b16fb9 SHA-1: 0046b8cf641892d3274876d7e61a4cd132031374 SHA-256: 74dc4276e97bdedcf1bedde8164cad9f1d16908e563c386ebff5233723bbb51f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with the primary suspicious URL being https://seumenha.ru/award?keyword=bfd+protocol+pdf. The PDF structure and embedded links suggest it is designed to redirect users to potentially malicious or phishing websites, aligning with the characteristics of a phishing campaign delivered via attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/award?keyword=bfd+protocol+pdf PDF link annotation
    • http://select-get.top/flower_garden_layout_planner_freeovkmk.pdfIn PDF document text
    • http://vejefulolite.22web.org/rirokimovix.pdfIn PDF document text
    • http://dronextactical.xyz/41470800514daakh.pdfIn PDF document text
    • http://mnogoturov.com/ch_ella_mi_creda_libero_e_lontanozn5u4.pdfIn PDF document text
    • http://kyhni.site/problem_and_solution_essay8ypoa.pdfIn PDF document text
    • http://abwaab.su/dedudulapimowezizixelk3s59.pdfIn PDF document text
    • http://dovulup.iblogger.org/does_arbys_still_have_sweet_potato_waffle_fries.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92861c1b-ecd9-4ef9-b16e-b4fcc1cda472/98464401690.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_8c7c50b261c9427fa8b22c70d024944f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b91b327-4f73-4820-93cc-2bd8ddb13aca/numige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669c493f-8a7f-4000-b5a2-0a08b151d2a7/58742988570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2bf7ba-db95-4cab-b004-9e60a8766ec6/bekugokavegadupika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ccf9d9-f9ab-43ed-85bc-24c678577403/28307177838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0375fc-6ef1-438b-9d9d-792da23437e4/1919040554.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_fcfe16169f1d4e3ca8aeebba6cd85102.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/874a6b5e-8262-4b7d-a7fa-bbb6aefd621f/beziz.pdfIn PDF document text
    • http://lagefow.epizy.com/disney_s_aladdin_game_for_pc.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_b7583c4b921c44328129f7498517cfa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3e3272-2d5a-4ca3-81ca-4674bff17dc4/surevikanugiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e1fc49-beb9-464f-99f7-7d6e5be304cc/las_escuelas_que_siguen_a_los_chicos_comprension.pdfIn PDF document text
    • http://bulexaresozo.rf.gd/45053657744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdb53e8-3ad8-4a0b-abc3-dd954b2c9ebd/tovivorotumigefigonumoke.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_a53b4610daed4636b90bd8369b7e4cb7.pdf?index=trueIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_c7589b5a551a4726933a95217babfb8d.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_32efe3f7a1a940eda163711d3636e435.pdf?index=trueIn 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_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 4812 bytes
SHA-256: 0906bd3395288624807b6feb142e504ae5815e05040fad7d54521465366185f1
font_01_sfnt_off00014579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14579 11136 bytes
SHA-256: 60974bc63d99a1aecf2680810f1e35a0a7c2f594f805dcd515592f670e817451

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