Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8546bf8abf9ba64…

MALICIOUS

PDF

82.7 KB Created: 2021-03-12 07:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cf02dbb58c75b4ec3493472174f3f91 SHA-1: 4b3d1696221b103fd1c674de26b6bb66254e69b7 SHA-256: d8546bf8abf9ba6430b109cc1eaa8f3e952bd2fbe8c68677eb1f5abfa61c0fca
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to drive traffic to potentially malicious sites. The presence of embedded URLs further supports this, indicating the document's primary function is to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://resalured.ru/award?keyword=arthur+c+clarke+the+city+and+the+stars+pdf
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5ffca1ed3bdb7.pdf
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5ff2236fbe03f.pdf
    • https://polabobaxadujo.weebly.com/uploads/1/3/4/7/134775235/koletagovawireg-nafoginaz-fetutenori.pdf
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/2fbc9ec78e97b.pdf
    • https://cdn-cms.f-static.net/uploads/4502236/normal_60311b1ec85ea.pdf
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/86bc09bfdce.pdf
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/6834619.pdf
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/riboso.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_600fe4925998e.pdf
    • https://static.s123-cdn-static.com/uploads/4413967/normal_5ff534eac909d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_3187adb115614071ace6ddfbe978d37b.pdf?index=true
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_d8de0d31ecbc45f9a5ac74f795acf824.pdf?index=true
    • http://popirarubinuluk.rf.gd/literature_review_of_pipe_bending_machine.pdf
    • https://s3.amazonaws.com/popisiburewixuj/which_book_is_best_for_sat_preparation.pdf
    • http://bolekatu.rf.gd/how_to_check_all_drives_in_command_prompt.pdf
    • https://s3.amazonaws.com/norozovijalu/alcoholics_anonymous_4th_step_worksheets.pdf
    • https://s3.amazonaws.com/bulalowisu/90461262785.pdf
    • https://s3.amazonaws.com/gedexim/mamukiginawutadired.pdf
    • https://s3.amazonaws.com/pasawe/37591585902.pdf
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_bbc82aa6254d4b00b6ccd130c4f764fb.pdf?index=true
    • https://s3.amazonaws.com/befarekogol/60497530654.pdf
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_dc7d339be75e49c2bdc05a5a3f8fc851.pdf?index=true
    • https://s3.amazonaws.com/fewifuwu/cara_membuat_template_ppt_keren.pdf
    • http://buripire.rf.gd/35838654941.pdf
    • https://s3.amazonaws.com/jezaxojipevu/rimolu.pdf
    • https://s3.amazonaws.com/mefadedosuw/what_are_the_types_of_termites.pdf
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_407c8be0095248ae87a81f5a3a228225.pdf?index=true
    • http://zegegapo.rf.gd/self_study_matlab_kya_hota_hai.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a2.bin
581be4df6a403f6bd42204f75f29e45552cfcd7a50190f19d0581be9f9298558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A2 5396 bytes
font_01_sfnt_off00011906.bin
2a74213d5bc18570afd97e5e289b672c1c08bc5a844e8b4ec908c84a12613ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 10284 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.