Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8f645864db602c…

MALICIOUS

PDF

41.4 KB Created: 2020-11-07 12:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 01a96b5836b0f8077a6c37e012eac7de SHA-1: 6b530bf82810a34c51520c4b801c07b36147f8f0 SHA-256: eb8f645864db602c6909e154f12ee915405770950ed888a7f5a72349703ca4c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious due to its function as a link farm, directing users to numerous external PDF files. The document body, though partially corrupted, contains text suggesting it is a "potential energy worksheet key", likely a lure to encourage clicks. The embedded links, such as https://trafffe.ru/123?keyword=potential+energy+worksheet+key, point to a variety of hosting services, many of which are disposable, indicating a tactic to distribute or redirect to further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.
  • 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://trafffe.ru/123?keyword=potential+energy+worksheet+key PDF link annotation
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/56487.pdfIn PDF document text
    • https://lobevebuwavija.weebly.com/uploads/1/3/4/3/134394718/lolalolabet.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/5744225.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/burokenuvosagemaxot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://daxazepuj.files.wordpress.com/2020/11/nipewesew.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0be917-a227-4a74-90d1-42e5a23ec9a6/92783815692.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/35243403113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a225e7b-1805-445a-a1c1-4b7adb0b3439/51460019441.pdfIn PDF document text
    • https://ziziwugo.files.wordpress.com/2020/11/lezamujuguxizitipikinojis.pdfIn PDF document text
    • https://gimubix.files.wordpress.com/2020/11/gomomizot.pdfIn PDF document text
    • https://rupuxijod.files.wordpress.com/2020/11/tinenupemekoxajub.pdfIn PDF document text
    • https://bapelogaref.files.wordpress.com/2020/11/the_move_to_global_war_ib.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_off00006512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 5204 bytes
SHA-256: 0ff23e1fe94454dfe16ba95635e9c0ec9aaf84dd625d312bf28040363088d218
font_01_sfnt_off000076d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 10056 bytes
SHA-256: 45afa3b745563e67487f42117dbf116e9b00fb51a1cfbdfd2f2d1bb9d8880625

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