Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7eeb2f2d5953e9…

MALICIOUS

PDF

68.9 KB Created: 2021-03-29 11:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8f25cb28cb28a840905665661c97ff77 SHA-1: b23de0962b7d3e305959fcc43d7d29ea82556403 SHA-256: 3f7eeb2f2d5953e995801094271d97db7555a447084d9f8f1168583bd5bfd888
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many pointing to a redirector URL, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation of PDF vulnerabilities to redirect the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=the+blind+owl+indianapolis PDF link annotation
    • https://nakubinigana.weebly.com/uploads/1/3/1/3/131379761/edaaf73.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/garopoxomuleti.pdfIn PDF document text
    • https://jurefuzosapob.weebly.com/uploads/1/3/4/9/134901670/8263924.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/zotisarotoxax.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/b6875384433f.pdfIn PDF document text
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/wumilekalus.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/5e02f5d4-c585-4c8b-ac13-f35d0c59504a/water_normal_map_shader_code.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/54907089784.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/24116837450.pdfIn PDF document text
    • http://tipaduvorul.epizy.com/11379591578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcaa4de8-4b19-4a21-8fa3-2df060f53242/how_do_i_add_mendeley_to_word_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/apiit_nat_2018_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/how_to_detox_and_lose_weight_in_5_days.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/how_much_does_vw_polo_service_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/online_magazine_template_bootstrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f2d0de-d028-4092-b069-a28690de6dcb/what_girl_names_start_with_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5129f8b8-a366-4db8-b02f-5b6484fb2d22/66974321823.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/apspdcl_2019_ae_answer_key.pdfIn PDF document text
    • http://kazaxese.epizy.com/coelho_sabido_3_serie_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/management_control_systems_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd67093-13da-4927-822d-68df6ac80b9e/13971598901.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_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 5132 bytes
SHA-256: 0de55bc84c8462baef83407bdc8331497820d12d0277e6db4cf40ef655f61f9d
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 10320 bytes
SHA-256: 4058879bd250eef0b725bf39ab8f98445a95c0d5d2b6f16f54c45d38e101f5cd