Malicious PDF — malware analysis report

Static analysis result for SHA-256 18579dc646a1a6f7…

MALICIOUS

PDF

41.5 KB Created: 2020-11-09 08:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a1b69d8e5263182bb844aa785930ba7a SHA-1: cb6e556712340e8c529a73bd3466d3788df24f1c SHA-256: 18579dc646a1a6f7946968df290140dc8125aa0a543e94f11056aa1d4ff99d99
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffi.ru/aws?keyword=accent+mark+in+italian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f9bc69e3031c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f87f81531795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fa7ccc9f0ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5f9389f890220.pdfIn PDF document text
    • https://finejorokisitoj.weebly.com/uploads/1/3/4/4/134495390/bejalevipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5f9ed9cca3b5f.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/zulugafibafewi.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/wiwode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8a4a12add1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://petivubeso.files.wordpress.com/2020/11/45882291551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a74ba3c-f02e-487c-bab3-a19a932e2800/pigidowugurajowarave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366a48b6-21e7-41c0-9b00-c47d93363b57/4374180574.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.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_off000064af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AF 4820 bytes
SHA-256: 50098615f15fa87ceeb3c694785adde337df98a23905b003ab7d0b3dd84c70d7
font_01_sfnt_off000074f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 11668 bytes
SHA-256: aebc5969f44de1d8bb8f18cd304d9f305ff47235906ca7e8bf304590a33aaf23