Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c32c4a45c33aa3…

MALICIOUS

PDF

77.3 KB Created: 2021-04-17 12:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 315d15fa562660f6dad152d2687a3d13 SHA-1: 49609341916968220b6e3c772b131c9c434ebc27 SHA-256: 38c32c4a45c33aa3b0fd56dfe2fe94f6a9e8c54b02e19512c7af505dafbe1f1c
126 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. It contains numerous embedded URLs, with a primary focus on `https://botokaw.ru/strik?utm_term=brother+mfc-j615w+ink+cartridges`, suggesting a phishing or malware distribution attempt. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is structured as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://botokaw.ru/strik?utm_term=brother+mfc-j615w+ink+cartridges PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381083/normal_605d697389a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_604abb16b5d24.pdfIn PDF document text
    • http://leree4.club/53972331935d93hw.pdfIn PDF document text
    • http://ersoil.fun/bongo_movie_mpya_mp4aupvn.pdfIn PDF document text
    • http://gefivinolegaz.22web.org/71401745146.pdfIn PDF document text
    • http://blaugrana.ru/gilemezumewufakeu9x34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_60541ce0394b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_60418cf3d4a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6037e61dc82b8.pdfIn PDF document text
    • http://biotringel.shop/vidopupindtenf.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/29cb8174-6ec1-48df-bd1b-ef3bd1362691/best_replacement_speaker_for_fender_blues_deluxe_reissue_amp.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/wix_embed_viewer.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_d134084994714b92998323cbccf04266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e552781-4400-49fa-b4be-5f4e9946804c/dofoxazoxiwolebo.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_58fc94dcea40418993d14010ee66cc80.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_6c3ba72b167049bb86cd80f5e7c2249c.pdf?index=trueIn PDF document text
    • http://lakarovorur.epizy.com/g-shock_rangeman_gw-9400-1er.pdfIn PDF document text
    • http://bofokagegawitap.rf.gd/list_of_german_nouns_with_gender.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_73bb40c08d964827b4af28784ab53954.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_b18ac9ce90bf49399bd89a2d23bff66f.pdf?index=trueIn PDF document text
    • http://suzinukofam.epizy.com/cara_convert_ke_word_di_hp_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af279425-4161-4d97-8ce1-c08c348c0662/what_is_the_history_of_the_sweet_potato_starch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492b3d96-7263-45fb-9ac4-0703335cfb1b/what_are_the_rules_of_active_and_passive_voice.pdfIn 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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 6048 bytes
SHA-256: a079c50adadea0a37523bfac1fbe0716a524bb657976599096a4bb57287ba770
font_01_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 10672 bytes
SHA-256: 844152ef52395da6d70aa0b2cbd3c8d01a9d3942a8e2f8f09c8b037774aef33b