Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf1fc7bd8edd3b…

MALICIOUS

PDF

72.8 KB Created: 2021-05-24 23:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21cffe3234d04c2c5b09af6840c7b7ea SHA-1: d0242632f652238753b7a47c6cc641007527bba2 SHA-256: bedf1fc7bd8edd3ba94581a947cbf87a65f29b011c612cf93b10bb48eaf94fe6
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://golowaki.ru/strik?utm_term=understanding+ethnic+conflict+pdf', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to direct users to potentially harmful content.

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 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://golowaki.ru/strik?utm_term=understanding+ethnic+conflict+pdf PDF link annotation
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/a736693ac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409610/normal_5fd051dca763f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459780/normal_6002994b3f14b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486356/normal_5fe569cf54ac8.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/8507220.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/070ae0732a41428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f78b18737.pdfIn PDF document text
    • https://razamilijukiw.weebly.com/uploads/1/3/4/8/134879964/pekiwojevax.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/kisopuxu.pdfIn PDF document text
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/28a1b626ce4e5.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/4752042.pdfIn PDF document text
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/bapeku.pdfIn PDF document text
    • https://xodomifosipux.weebly.com/uploads/1/3/4/8/134865855/c97e5b4e839a1.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/newogunoku.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/rurosaveruk/kenmore_vacuum_repair_manual_online.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/methylene_chloride_sds_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4925bd-00a7-4db0-9d1b-4c7f7708690c/adobe_after_effects_cs6_tutorials_for_beginners_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/acrobat_reader_pro_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7fa46d-da86-456b-a92f-0a8c8fa6d157/71263214070.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/activities_for_teaching_place_value_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/android_sdk_for_unity_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cf4804-f06b-4aab-ae2f-c2e146bcf126/nilunibojevajanideman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f25fa54-4105-467c-90e5-83ae9d6f47f9/all_my_sons_moving__storage_of_dallas_llc.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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 5408 bytes
SHA-256: 671b31afd631a0bc2ae69c9ec08fa0246ff4dd79ed5989a09e6b3029ce81ef8a
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 12868 bytes
SHA-256: c4ac5c96c2885e7167b0c9ba20ec865d4baf5cd289dd6c142717be41aa61c0d4