Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc6b2228f603d9e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 10:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 836153ed3301ab04b743eeeee8802e67 SHA-1: 5df7e70d644e56afbd401eb1594cef62ca118140 SHA-256: dbc6b2228f603d9e474d430e6d82ffd09e19a43633e98524663d73b5a1e9c691
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=free+facebook+cover+templates+for+photographers PDF link annotation
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/kuvofazisoguxaro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd9f6e47afdf.pdfIn PDF document text
    • http://presalon.xyz/jetawigivurew0yxy8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_6027ed5d13c37.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/hhgijfO/memes_wars_2.pdfIn PDF document text
    • https://tulipigalid.weebly.com/uploads/1/3/4/3/134392473/sogaku.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/qhigcoj/wwe_raw_roster_2003.pdfIn PDF document text
    • http://superheatbelt.xyz/11940037038vls77.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/hahahip/what_is_dinghy_service.pdfIn PDF document text
    • http://afracheat9.xyz/futavalobobimezamofime6551i.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/2695c6c895.pdfIn PDF document text
    • http://skidki-day.store/xiruzepojaiwocb.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jcsgeBX/93058035454.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/Vhfxege/get_in_shape_in_30_days_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_605490169f3ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448323/normal_603b6f5f0a29d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/wuwozotewalumotewa.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/how_to_crochet_a_beanie_on_a_round_loom.pdfIn PDF document text
    • http://ratadipemor.epizy.com/ye_barish_ka_mausam_whatsapp_status.pdfIn PDF document text
    • http://sosivaji.rf.gd/sampling_methods_in_analytical_chemistry.pdfIn PDF document text
    • http://juxibokadunume.rf.gd/wepolamufugozeteza.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bofupug.pdfIn PDF document text
    • http://tokeparab.epizy.com/rocky_balboa_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/financial_report_analysis_meaning.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_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 5648 bytes
SHA-256: f1667680aa52d94ac431969fd19a84f4cddfa3007a3ff5a9025cf9d239a77c58
font_01_sfnt_off0001071e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071E 11020 bytes
SHA-256: 724f0c3094f143fccd83180cc2ee480ec549db98fca48e32ae675243b47c8a23

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