Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19db3711f01b14d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-08 07:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 7feb3bb477389e061502bf845ad0ecd5 SHA-1: 2ba036821dd228283ceecb838133d72e0ada2ed2 SHA-256: a19db3711f01b14d97b3a2b0b97c0ee7d488ca2514a2424d4c494089e1876c05
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a link farm on disposable hosting, with a primary external URI pointing to a suspicious domain. The document body, though partially corrupted, suggests a lure related to 'Ikea leirvik double bed frame instructions'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via the embedded 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 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://midufefew.ru/strik?utm_term=ikea+leirvik+double+bed+frame+instructions PDF link annotation
    • http://punevufazeji.iblogger.org/redovowejuzev.pdfIn PDF document text
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/befapa_buvugubedi_tasuzitus_zanabinimi.pdfIn PDF document text
    • https://kefepifumadig.weebly.com/uploads/1/3/1/3/131383651/janetofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366984/normal_5fecf46787732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443326/normal_600d8b9e3c270.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/9064682.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fd32ca11fb30.pdfIn PDF document text
    • https://jadikabejoza.weebly.com/uploads/1/3/2/7/132740193/vonivotupipeb.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/nuxulikiwab/kerbal_space_program_enhanced_edition_ps4_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92df79f8-1354-4028-af78-7033742628d5/delizojoravuduwugitat.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/87990227178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564db9ce-8124-4d28-8ba9-0f8028e7d226/67807139408.pdfIn PDF document text
    • http://jitemawuvefogox.epizy.com/vocabulary_games_and_activities_a2.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/vasajarevisekij.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/do_cooked_vegetables_have_more_calories_than_raw.pdfIn PDF document text
    • http://naxezutozotos.rf.gd/mesejakiresameb.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/rubategevuvej.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/beltone_hearmax_app_for_android.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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 5368 bytes
SHA-256: 295e08298b8b87002da1dfadb6bfd078087278616bea983d3b3c0de3fe15cf7d
font_01_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 10596 bytes
SHA-256: a2423881112d0c5b625eaa37da8173bdda150b3fdf3f4b42e3194cf40b206c4f

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