Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69d3fcc631c8193…

MALICIOUS

PDF

75.1 KB Created: 2021-05-01 09:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 36be42bdb11de83c407838da54b1ae84 SHA-1: 2f33dfc65dd44b91a0d4f8dce9ddf857b5c125dd SHA-256: d69d3fcc631c8193818db84fcdcec208ed108697abddf27a60bf90e5a88bd544
126 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the ultimate destination. The primary malicious URL identified is 'https://xajibur.ru/strik?utm_term=how+to+tell+if+someone+declined+facebook+friend+request', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=how+to+tell+if+someone+declined+facebook+friend+request PDF link annotation
    • http://chemistryplus.space/palofusmq8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5fe2cadf7c56d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_6007a0de310f5.pdfIn PDF document text
    • http://laura-egorova.ru/pobozedamobadusijamitawokrcdp1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5ffcf8e45b30b.pdfIn PDF document text
    • http://lapivezog.22web.org/zemidose.pdfIn PDF document text
    • http://ig-copyrightviolation.com/7953215178jdzdy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403683/normal_5ff7969c8f5e1.pdfIn PDF document text
    • http://gnfcns.info/honeywell_wireless_thermostat_not_communicatingks8ul.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/f9182929-0535-4d3a-a813-4c290069e1ad/jikapomawenibo.pdfIn PDF document text
    • http://kodadus.epizy.com/volume_of_cylinder_worksheet_math_drills.pdfIn PDF document text
    • http://jukaxifowiju.rf.gd/95591886118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a04cffb-21e5-447d-87be-4d143a035546/will_there_be_a_new_harry_potter_film_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432b2354-e2a3-46b8-a9c3-239eb32d3683/41160552432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c1daaf-4ee7-4537-bb54-d322ac369626/hindi_song_lyrics_starting_with_alphabet_n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ead3f5-4247-4e14-bf5f-b70c462bb9bb/asus_rt-ac68u_vlan_tagging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2235101d-2768-4117-8757-521441622016/will_there_be_a_fantastic_beasts_3_book.pdfIn PDF document text
    • http://niforubuduxema.epizy.com/formica_warranty.pdfIn PDF document text
    • http://buvozosasubatib.epizy.com/kubagelib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b46a859-7226-4604-a9e7-6f4ef8cda4ff/how_to_program_uniden_bearcat_trunktracker_iii.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5552 bytes
SHA-256: 4a050810c103399dc6f7131f61119a5a68333ec73d05f1a0afb8ff91460ce29a
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10596 bytes
SHA-256: f2913f95bb98df43d064cc55cb52d707e4dfea239a227811c141eb2c5dc8b0c2

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