Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31925de328b1a15…

MALICIOUS

PDF

74.1 KB Created: 2021-03-26 09:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d9c0f9f18151535a190c17fbf41bb46d SHA-1: c2dc045ea183e93aa17166628bf93968ed882383 SHA-256: e31925de328b1a15a5de7913d21aec0e6215a35138312d2b4d92ff15653094e2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://baarspo.ru/123?utm_term=free+online+browser+multiplayer+games+no PDF link annotation
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/1501313.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/4546032.pdfIn PDF document text
    • http://my-credit.info/the_cube_method_spreadsheet2iz6a.pdfIn PDF document text
    • http://micrometerdigital.xyz/earth_and_moon_live_wallpaper_for_pcooufo.pdfIn PDF document text
    • http://dujekuba.22web.org/18610566999.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/repuxifaniwaxu.pdfIn PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/926180.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/8c5b65365aa.pdfIn PDF document text
    • http://delayikapy.xyz/can_you_use_procreate_on_ipad_air_1dv0qt.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/woxipiviwuzi.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/1bc02.pdfIn PDF document text
    • https://fivosegexaf.weebly.com/uploads/1/3/2/6/132683078/8f3b964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jepameji.rf.gd/67894381761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34311d46-416d-4b4b-96ea-46186f4c3957/how_to_change_remote_control_for_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16676a2b-3d3d-4a68-83e8-362427ca7345/bopamimupuniji.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/luzawoxomudorimumalemedux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a544d5-5377-49f7-be86-0b9b167312de/96109124543.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/gumakovemon.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/47652242074.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/eaton_transmission_fault_code_21.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5428 bytes
SHA-256: c20316af27bbea74dd93dfdc0e74853716b99697fc1aeeb1261befa95ae379d9
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10920 bytes
SHA-256: b3c9748740319a03b20e4bd2020830b8691c3a28c716588e2fd56f64796a767d

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