Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cdc1bd3dd948bc…

MALICIOUS

PDF

44.1 KB Created: 2020-11-05 19:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: cfd87685337fbc9a487e221f1b132690 SHA-1: 09f433040f836ad9c20a0f1d761db396cdd92d12 SHA-256: b9cdc1bd3dd948bc454608172372ea94ef52e5b9bf59247882ce4470fc2f9c5e
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/strik?keyword=iowa+docs+login PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5fa21d44b0e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5f936df4682c1.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/d9921aa919.pdfIn PDF document text
    • https://leziwave.weebly.com/uploads/1/3/4/4/134446015/xijelu.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/5329187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f947d3c86163.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/2232836.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://s3.amazonaws.com/fojaxexino/punekar_sc_st_act_book.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nutevisano.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/94825564203.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/food_pantry_in_sussex_wi.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_off00005f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 4628 bytes
SHA-256: 13cdce1e5fc61a514e4d04014fd183aa28a7f3f20696b04cdb07833601f1cb01
font_01_sfnt_off00006ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE5 11476 bytes
SHA-256: 1c3faa5a14a78d8a2eb46717dddb7612c5150ea628cd2609810575e52e0f4aa7
font_02_sfnt_off000095f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378