Malicious PDF — malware analysis report

Static analysis result for SHA-256 952539d4b4f93330…

MALICIOUS

PDF

79.6 KB Created: 2020-12-31 23:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 921a9afa8e54734ef8357b729901408a SHA-1: 5cf64eadd1c69cef77fe1623ee7caabd7a8381e7 SHA-256: 952539d4b4f93330e200823c1e01e9d2eefda926ff159e76cbbe6355a68bc97a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to disposable hosting services and are used in a link farm pattern, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic indicate an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://trafftec.ru/strik?utm_term=lego+batman+beyond+gotham+android+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fca204309d2e.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/c3ecfacdf1.pdfIn PDF document text
    • https://sopizelofixafav.weebly.com/uploads/1/3/4/4/134438569/xurulugogesemukenaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fe1c241eb8ab.pdfIn PDF document text
    • https://wibanakipose.weebly.com/uploads/1/3/4/3/134361509/tibujudidivuges-gesubupa-julubesutonaj-foboxenoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/aieqMjh/wavex.pdfIn PDF document text
    • https://guwixuwekolarap.weebly.com/uploads/1/3/2/7/132740580/tigovejudewikuf_fawofi.pdfIn PDF document text
    • https://mesobesin.weebly.com/uploads/1/3/4/5/134590010/xetesebazu-kikaja-vevaxe-nenawobata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fc2568f10183.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/72f986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc9eff8-15e1-4849-89a5-ef6627edfa9c/welcome_to_camp_nightmare_goosebumps.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/hepatitis_b_testing_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40f94c2-031d-4a14-82b2-910b59696011/dsi_action_replay_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/female_majin_buu_names.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 5264 bytes
SHA-256: a4bb36da67170041c89418c3069fb20132811f58035019e97fde502c8ddb0d95
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 11268 bytes
SHA-256: 16a9513f560ecc6a107dd02f61446caa2485bd10f3796061988f108ab608d176
font_03_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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