Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a61a9ac6f08e234…

MALICIOUS

PDF

78.2 KB Created: 2021-03-30 18:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72299ad05e20a2e0839a1eacd25f19f0 SHA-1: 951ff1b47de5a1cd7a6c5bdd7ca5c76a4b7135b2 SHA-256: 4a61a9ac6f08e234f92954f220e73fc01d594b7bb4a66b7e7e04c847d4506b43
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL leads to a keyword-based search result page, suggesting a phishing or content distribution lure. ClamAV detection and ML classification confirm its malicious nature, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=guide+to+fashion+sewing
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ffa517cbe53a.pdf
    • http://3203epworthcres.com/batirug15zp.pdf
    • http://nikaold.site/800769980902dlfc.pdf
    • http://drive4mclaneeffingham.com/apel_in_asteptare_pe_android1yrdf.pdf
    • http://negimemexib.iblogger.org/numbers_that_preach_444.pdf
    • http://digitalliteracyinstitute.com/can_i_get_ocarina_of_time_on_switchn9l76.pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_604d9b971f72b.pdf
    • http://digitalmedialit.com/electrical_code_simplified_house_wirk061r.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zozoresupiz.epizy.com/jiwitazisa.pdf
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_fb2ac87ffaf043a38d53a9dd82ff7bd7.pdf?index=true
    • https://s3.amazonaws.com/boduxatavepe/rosca_1_4_pulgada_a_mm.pdf
    • http://modefumagija.epizy.com/zifixotepunuvajoxoze.pdf
    • https://s3.amazonaws.com/rupatojuko/new_hypercholesterolemia_guidelines.pdf
    • https://s3.amazonaws.com/pusori/great_are_you_lord_sheet_music.pdf
    • https://s3.amazonaws.com/dupula/average_cost_to_re_sheetrock_a_room.pdf
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_526c58f8f2454fe38ad1faa3e98566c3.pdf?index=true
    • https://s3.amazonaws.com/sojuravewi/enga_karuppasamy_god_songs_free.pdf
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_dcd082eddcdd42979e525052f24fab5b.pdf?index=true
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_cc65f5de554f4d59a58f56b3824fd915.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_d8c944fee33346fba5beb14a663367c9.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_43502cad2bac467fa3b7a8b6a0a826dd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75a.bin
53aa7cce72ffbefe4f128054801b485e5655bfb6ef5e7c76de39c159802c9cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 5048 bytes
font_01_sfnt_off0000f893.bin
e240a0e36e77824df8749afa6a4c8e4b30303de83dc5a6fdb10395ba75df7958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10936 bytes
font_02_sfnt_off00011dd6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 4324 bytes

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