Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d0419f3d2d1ea2…

MALICIOUS

PDF

83.0 KB Created: 2021-03-08 15:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 93928f083a591d727b35435961fe8da7 SHA-1: 71fde2f641f088ba47f429f397a3430f12da6de7 SHA-256: 41d0419f3d2d1ea23e741f772d7f269c79a5de3e49ff36c73b9744e17e159367
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The presence of a specific search term ('Kubota bx2200 hydraulic oil type') in one of the URLs indicates a targeted lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=kubota+bx2200+hydraulic+oil+type PDF link annotation
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/435547.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/2890155.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/pabumajuki.pdfIn PDF document text
    • http://shop50off.info/745416341315z8iv.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/xenigu.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/3016958.pdfIn PDF document text
    • https://solekavugixe.weebly.com/uploads/1/3/3/9/133999951/374663.pdfIn PDF document text
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/f3de30819d.pdfIn PDF document text
    • http://ch-redirect.icu/7.62x54r_spam_can_markingsh6246.pdfIn PDF document text
    • http://kismykeitio.best/un_curso_de_milagros_audiolibro4wqmf.pdfIn PDF document text
    • https://pozukelemiku.weebly.com/uploads/1/3/2/6/132682282/9635978.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/93a7d888b.pdfIn PDF document text
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/magugut-megawug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84a7f270-46fe-4233-9bed-f378c6dfffde/jipuvofov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57250452-bcca-4515-9d2a-0ab2c6f53ba7/thomas_merton_quotes_on_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb2f2fa-b2af-451d-9517-445848119af5/bexine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bcd59d-c294-491c-ab89-9eee19756508/8903894509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac0e6ea-5e96-4912-9dbc-2a0f641f66e4/how_long_does_dough_cycle_take_on_bread_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f4666e-1933-4d6a-99f5-89567c8eaf2d/who_wrote_12_days_of_christmas_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f96020-c10b-46be-bcba-2781b7aaeab0/2780058917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712ebe1d-9c7a-4a9c-8bbe-fda76f4bedfd/pesolanije.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5312 bytes
SHA-256: 5f2fc4ff2a42ac5dfb9951a8adb73ea9b53a14c68f7a00a11a3e53042f482cbc
font_01_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 15036 bytes
SHA-256: 6f08da4fce9fb4a558cac500efdfc3bbf893170be3464039a166661655773f9c
font_02_sfnt_off00013079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13079 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2