Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc4901b03e01fef…

MALICIOUS

PDF

72.0 KB Created: 2021-01-20 08:55:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 9d901d2ade1dfd7fc9b518539d551077 SHA-1: 6fd21674781c92615b2b90804c8ba54b9bab2598 SHA-256: 0dc4901b03e01fef6dcb0cad8f65b504ded7690d53664023a5988766f7aca0a6
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=example%20of%20a%20counterexample%20in%20math PDF link annotation
    • https://vawoxaju.weebly.com/uploads/1/3/1/3/131379227/2141936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8910e359219.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/4698047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5f9c0c9484e22.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/zoborogiwosos_xulowakolidadu_sejemuvinav.pdfIn PDF document text
    • https://site-1178794.mozfiles.com/files/1178794/civilization_2_free_for_android.pdfIn PDF document text
    • https://sixumegeb.weebly.com/uploads/1/3/4/4/134476160/wutuzosagefizolenak.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/8502769.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/f11c62819a6.pdfIn PDF document text
    • http://ronojalad.22web.org/kugurinobopaw.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/rebomedug/tour_itinerary_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/tigibisewabik.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/anti_aliasing_method_amd_for_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/stipulation_of_dismissal_template.pdfIn PDF document text
    • http://bividit.rf.gd/zafijig.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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 5100 bytes
SHA-256: 9df2be7df8e0953e054b333e4db5b22b8d98329afd8e683929107af3fe59f1fc
font_01_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 11348 bytes
SHA-256: eb129cae2560740676a7f302a46294074c0d51eae44e1aa49d9647fb8f3fd7e1