Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2907c9b0529bb25…

MALICIOUS

PDF

75.5 KB Created: 2021-04-02 18:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee448b1abd83d5977539a5b92c4b5f59 SHA-1: 5aa0777a9a3a3e4f4353036a60f7109d05b3f7ac SHA-256: b2907c9b0529bb256a1d92474037220a5cb13cf64b1e5abade2143b600332df4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of a link to 'botokaw.ru' with a search term related to a repair manual suggests a lure for phishing or malware download.

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://botokaw.ru/strik?utm_term=cub+cadet+ltx1040+repair+manual PDF link annotation
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/mesilimilerutux.pdfIn PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/a3811d56a.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/kazepalusomob.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/zimuvuvojenubim.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/4582220.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/dunosofuse.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/kiwuwikujujezipinu.pdfIn PDF document text
    • https://norafolarujasaw.weebly.com/uploads/1/3/1/4/131453206/bokoxibivirusojur.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/sumidubexadunutikugo.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/7ce8a4fe3.pdfIn PDF document text
    • http://sosuwede.iblogger.org/accuphase_e370.pdfIn PDF document text
    • http://fugoverud.iblogger.org/ansys_fluent_tutorial_book.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/655773ad-9021-4e64-bf7f-6cb1642cfe76/char-broil_tru-infrared_patio_bistro_electric_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fd9955-5b0c-4fa5-99f6-7fb58cf0d0e8/gamma_distribution_in_matlab.pdfIn PDF document text
    • http://risexogukif.rf.gd/64949847748.pdfIn PDF document text
    • http://zimeketoxera.epizy.com/moment_js_date_format_with_timezone.pdfIn PDF document text
    • http://dadodoserosif.epizy.com/setokopafita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4846637f-c630-43f2-9bb6-c1436f39020e/89081143506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49dd502-caae-4c6c-baee-bd4ffceda67b/49237409327.pdfIn PDF document text
    • http://pixividazexew.epizy.com/samsung_soundbar_hw-h550_remote_code.pdfIn PDF document text
    • http://zoribele.epizy.com/bsbadm506_assessment_1_answers.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5436 bytes
SHA-256: 9a75a6fb2cb1fdf03753a3f80ceec07f0c1123a4a8735aa1f85724c54eb0d831
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10280 bytes
SHA-256: 8d529c82c8148ea87ad4c48ebd84f2d790b8cab2ddd24ee63d9ba8225e8dd55b