Malicious PDF — malware analysis report

Static analysis result for SHA-256 a854e8dc205005da…

MALICIOUS

PDF

115.4 KB Created: 2021-05-21 19:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ee37ea6e6ba1af28d3b01d03746dafa5 SHA-1: 71849f253a723bd02670d22661e6c48f9b3ad20e SHA-256: a854e8dc205005da6135007929e3dd8abfb022aff8409a3d6465be1f20b76b6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'nipisod.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious content. The document body, though partially corrupted, suggests a lure related to shoe size conversion, likely intended to trick users into visiting the suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=women%2527s+shoe+size+conversion+to+men%2527s+chart+adidas PDF link annotation
    • https://zipufalazuviw.weebly.com/uploads/1/3/1/8/131856517/eb5fb0a355fc63.pdfIn PDF document text
    • https://kudojazejugir.weebly.com/uploads/1/3/4/3/134322101/bumoli.pdfIn PDF document text
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/tuzasivegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372753/normal_5fcb0b868d6b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_6059a2da7cf1a.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/c59f7b41-408d-4e1a-b2ea-c4f2f40fb062/tukixiniziwakawuka.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/cfdi_en_linea_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/airdrop_between_android_and_apple.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/cambridge_learner_s_dictionary_english-_turkish_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/fundamentals_of_engineering_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32af9cb-52ba-42a5-a810-468c1a93ab88/mulizazowivavodesazisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c5ef1d-d540-4b2b-833c-bd3de5d8c965/mininenuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/example_of_freuds_theory_of_personality_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ffac57-41b7-4879-a968-4fe280cf2a2c/2018_ap_world_dbq_rubric.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/hp_photosmart_6510_printing_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/calvinism_reformed_theology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e24e9c5-6de6-45d1-bdff-bddf72959481/how_to_get_a_payday_loan_in_georgia.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_off0001839f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1839F 5304 bytes
SHA-256: bfc2a54ce709d66d7e3cbcfb14be3168ea59e8d7b3a2cb4e35c4f32f11f3d476
font_01_sfnt_off000195a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A0 12576 bytes
SHA-256: 1db22981bb116c9e78cb61bf5d899610123ba039fa8de2f335e9896b357a9c69

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