Malicious PDF — malware analysis report

Static analysis result for SHA-256 470efd5a41277380…

MALICIOUS

PDF

90.1 KB Created: 2021-05-17 09:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df0e376d2831058eb9039eae3b7241df SHA-1: a6b17e78f304b636bb96dd7f319494fe1f711eb4 SHA-256: 470efd5a412773800c8550deb0dbb92479df4bdfe9009fdc2ba9843e166912ae
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, likely to facilitate SEO manipulation or distribute further malicious content. The primary malicious URL identified is vilenefex.ru, which is likely used to host or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=first+aid+usmle+2021+pdf+free+download
    • https://cdn.sqhk.co/xurajalijok/jfcsjam/ted_talks_youtube_addiction.pdf
    • https://cdn.sqhk.co/dutudovajud/iijCjab/43122240043.pdf
    • https://cdn.sqhk.co/vebapejun/hfCxhje/sunaj.pdf
    • https://cdn.sqhk.co/gulifunanale/2HkJyAO/4061321093.pdf
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/midefuka.pdf
    • https://disipewadapa.weebly.com/uploads/1/3/4/8/134870645/jajuzu-daben.pdf
    • https://pomorewosijimop.weebly.com/uploads/1/3/2/6/132681296/c115dd.pdf
    • https://cdn.sqhk.co/bemovunilupo/jhmjejc/costco_samsung_family_hub_counter_depth.pdf
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/wexadolukarinorow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kujesulad/general_microbiology_exam_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/08a46f5e-0885-4e10-9127-d934794aba4f/42292551702.pdf
    • http://xejawaji.myartsonline.com/wupawakorodurujewi.pdf
    • https://uploads.strikinglycdn.com/files/416e57e2-5058-4a94-b3b0-f5720fdffb54/which_foodsaver_is_the_best.pdf
    • http://misanedajog.myartsonline.com/burda_macroeconomics_a_european_text.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/hearts_of_iron_3_guide.pdf
    • http://limoxukuk.atwebpages.com/legenonigosisururusujab.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/cebuano_bible_free_for_laptop.pdf
    • https://s3.amazonaws.com/pasawexawinogad/58529545431.pdf
    • https://s3.amazonaws.com/lanaladu/kumupeji.pdf
    • https://uploads.strikinglycdn.com/files/d8a07c7f-1bc5-4b7d-83ae-8831fc6d2bfd/ipolis_forgot_password.pdf
    • https://s3.amazonaws.com/rodiligarexo/how_to_replace_lg_washer_drain_pump.pdf
    • http://satawakerexe.atwebpages.com/best_books_on_personal_finance_reddit.pdf
    • https://uploads.strikinglycdn.com/files/01ad35ac-dd8b-49d0-87e9-f07209825535/graco_literider_travel_system_lx_with_snugride_click_connect_30.pdf
    • https://s3.amazonaws.com/jejulurowev/98042656057.pdf
    • https://s3.amazonaws.com/gifiz/ditir.pdf
    • https://s3.amazonaws.com/jemazejodep/qu_significa_languideciendo.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_off0001225e.bin
5b99b8da6d2974b71c0d26e16fbce3467bef014eff98477c4590c136ec2b9771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 5560 bytes
font_01_sfnt_off0001354b.bin
86fe46d2bc85be03ab3c6c8a30ee141fcef20934e42432adfa00aa850b94fe8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 10944 bytes

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