Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d6380785030e8a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-26 06:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 070ff6fb1115e4593fec37f94efa361a SHA-1: 3f85cc54c7ed083c190aafede34d0dd16cce5893 SHA-256: 17d6380785030e8aac903da773621e8bbf6fbb6ace3a1d758e87a0b7a079e5a5
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms and redirectors, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://seumenha.ru/123?utm_term=charlie+brown+jr+ela+vai+voltar PDF link annotation
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/526.pdfIn PDF document text
    • http://whitetwo.space/hydro_dip_tumbler_with_alcohol_inke2l3y.pdfIn PDF document text
    • https://cdn.sqhk.co/duzokezubeka/hcjj4Vl/ginoguvemodef.pdfIn PDF document text
    • https://lawoxotat.weebly.com/uploads/1/3/4/5/134587222/nipam.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/iig5Agf/dr._driving_2_download_for_pc.pdfIn PDF document text
    • http://cetakchantek.com/acca_june_2021_exam_datesubsfk.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/vufaxamipo.pdfIn PDF document text
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/9689815.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/rilevi_pekipivodali.pdfIn PDF document text
    • http://load-bcp.com/how_to_put_together_an_older_total_gymlhaw8.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/hhfIHha/life_is_strange_chloe_and_max_fanfiction.pdfIn PDF document text
    • http://sq11mini.com/how_to_cite_internet_sources_in_text_harvard_stylek6151.pdfIn PDF document text
    • https://cdn.sqhk.co/firijanab/Kgghcji/85177506817.pdfIn PDF document text
    • https://timowerudep.weebly.com/uploads/1/3/0/7/130738780/julopof_zitud.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/makofapefomarum-wisuzateguma-kinerux-walavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wezukep/gagazoxukokima.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/wugipaxetejigavababujala.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/can_you_eat_mcdonalds_breakfast_on_keto.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/loud_ringtones_for_android_phones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/82406431872.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/ea_sports_ufc_2_career_mode_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/foreign_currency_revaluation_report_in_ax_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/baking_sheet_paper_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/lififogepedovogulefoji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 4776 bytes
SHA-256: b6fbac1c2b8cb6aaec703f0a4ccce01eda092dfbd6125645c3094556fcef95b9
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 11988 bytes
SHA-256: 59690c8c990780f316bb3d1ecc95cdba5b298a2efbe49ff24791c848e1bb26e5
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333