Malicious PDF — malware analysis report

Static analysis result for SHA-256 161f249cffda83ce…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ec714abfec4dbbc4e5811c99bb7d5d45 SHA-1: 57530f6015e3b7a4164add29fa0528c1b1e8542f SHA-256: 161f249cffda83cebea0b7f32a68acc6fbcb222fa24e0c18be389463cca6a077
164 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, and contains a significant number of external links, indicating a link farm. One of the embedded URIs, 'https://nipisod.ru/strik?utm_term=gravely+148z+owners+manual', is likely part of the malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to an owner's manual, aligning with a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=gravely+148z+owners+manual PDF link annotation
    • https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/7b1917d2e6b6.pdfIn PDF document text
    • http://life-news.tech/betazojedaxufida2v5jl.pdfIn PDF document text
    • http://how2clever.com/58931727742kcm2c.pdfIn PDF document text
    • http://vashmaster.info/the_boy_in_striped_pyjamas_film_analysisesy1m.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/6636639635575f0d.pdfIn PDF document text
    • https://dimofusuraz.weebly.com/uploads/1/3/4/6/134677966/15f7fd2f3384c.pdfIn PDF document text
    • http://mir23.xyz/doxomepibawitituta69kc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/95401419747.pdfIn PDF document text
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_23f8d4062e104746b661e68fbc76724b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04c93c93-e285-4300-959e-ae26c15de38a/simple_java_programs_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2521d6-cd55-40b5-9403-64587fe1f45c/buwasizudigoguderavenufuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f5e67a-92c5-42be-9620-5f5dc1cf9263/reiki_level_1_attunement_procedure.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/61977043854.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/how_to_change_head_on_wahl_lithium_ion.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/brewing_classic_styles_esb.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/45488690012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d230028-51dd-487a-b1ec-e2b5c55634b7/85851379180.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_b93dd24f8ba5465a83b3dd5e9d6af52f.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_891b18f06f99415fb8ba16880740707b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/vocabulary_workshop_level_e_unit_4_answers_synonyms.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/6751163215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381c9358-d49a-4c1f-b50e-3283bdb7be40/28347977454.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/aviation_operations_management_standards_and_guidelines.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_a5885d3dca434bf2adec0829a70d26c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/damerirazib/metformina_causa_acidosis_lactica.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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5500 bytes
SHA-256: d98f8cc85f6a420e9ae82b5f2d7d421ac82dfd97253cbfc6ce1f176711d492d4
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 11648 bytes
SHA-256: 4bec4d19d3befa03f3e5649ed660b23ab271ad8ef27f4a4a7eadcd713c79d0c5