Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b95cbde3117611…

MALICIOUS

PDF

79.3 KB Created: 2021-06-11 20:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8424a2d3b0e18b6d5ea8573d185fb062 SHA-1: aea57fe2fc0d4abd35b0a5eb7c74efa33e1c1b99 SHA-256: e6b95cbde3117611f4124eec51fb75523a11de1c127a1aebb7ae25803b2a3f1f
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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://xajibur.ru/123?utm_term=shadowrun+6th+edition+character+sheet+fillable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477164/normal_606da054d0d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460058/normal_5fe1c5809e950.pdfIn PDF document text
    • https://nufazuxumojo.weebly.com/uploads/1/3/2/8/132815750/fizuje-bigikolovi-wupelikuselas-fubewun.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/8c59a.pdfIn PDF document text
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/wadod-tigowum-nuwonuruno.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/xuvug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_5fdab85af0b45.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/85d9f7f2032.pdfIn PDF document text
    • https://minesipapotevu.weebly.com/uploads/1/3/4/1/134108733/7426503.pdfIn PDF document text
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/kidafaromirujavap.pdfIn PDF document text
    • https://varapisuru.weebly.com/uploads/1/3/4/1/134109150/108a4a8be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_6066b34c601ed.pdfIn PDF document text
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/0847d59f39c.pdfIn PDF document text
    • https://sususijofazitut.weebly.com/uploads/1/3/4/4/134462406/9201276.pdfIn PDF document text
    • https://rozusuwiloguf.weebly.com/uploads/1/3/4/6/134644861/lawalamizexetibewi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_6009cff565737.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/6075207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikitaxif.pbworks.com/f/evaluating_functions_task_cards_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab40a6c-36a0-4be1-83b2-20416a2d0d07/what_is_the_theme_of_the_story_charles.pdfIn PDF document text
    • http://wurutaw.pbworks.com/f/zs_dead_detective_vs_nine_deaths_cat_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f513bb3-a6ae-45d7-b946-11de41f3b29f/12403344181.pdfIn PDF document text
    • http://tulusozofel.pbworks.com/f/dnd_5e_blood_hunter_build.pdfIn PDF document text
    • http://gaxezuv.pbworks.com/f/army_of_darkness_defense_2_mod_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82dcc6ea-4730-4170-b7ea-5710c5356c21/96982977569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c616cdb-4b30-40a6-b1d3-05449e572dcf/62860413294.pdfIn PDF document text
    • http://lodedeti.pbworks.com/f/film_salo_or_the_120_days_of_sodom_online_subtitrat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e98f42-eda1-445d-b6c4-b5fad79ab31b/rusopifeni.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_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 5596 bytes
SHA-256: 7a8c1c51747826b9459da9875d949d9f8bf27cf6c76d382e5685f0f808095547
font_01_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 10292 bytes
SHA-256: 7d177711a76a0a83fa5eb19a3871e7a4f15a86a2054ffff4b39e470ac225e7f6

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