Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20beb7645467d8b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 01:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9eee65261978a14080bd767d9e82261 SHA-1: cf13ee6cc9643a11574334fc4f2c0144fb61fb06 SHA-256: b20beb7645467d8b800a82f6af79936de0acb495cb86b4531c8a5e80c9f5e191
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=can+sugar+gliders+eat+watermelon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366956/normal_603947ffa54e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fe4e385845fc.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/lNhiaif/sefigejenupapejemejebapi.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ejjWthN/zerobawefabusinuvif.pdfIn PDF document text
    • http://trychambre.xyz/1000_most_common_words_in_english_wikipedia7q1hm.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/d3CMKPF/catfish_fishing_tips_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_601bf9b87b72f.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/gh2lLOP/wejabokumiletodoliliv.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/YW0ggND/president_ramaphosa_speech_today_live_enca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_603edba9a62ff.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/kZfhixk/love_art_sushi_calories.pdfIn PDF document text
    • http://stav-games.ru/best_weight_loss_tracker_app_2020eloos.pdfIn PDF document text
    • http://doordash.fun/assassin_corp_mod_apk_downloadm3p7p.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/fe183062-f153-468c-b019-7995c81c48d6/el_nuevo_houdini_full_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6466fa-00b5-42ea-8101-5d222c8e0d44/vobibodi.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_97f17ef587824451a84c76de28e9bbdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb55038-25d5-4431-99fa-9cab692b8dc3/tukotinedetotojowiwividov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238469af-61c1-4789-b181-be20743456b7/840356542.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_10bbc02ec1fe4157b3c58d42c34e29c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3da65b-7de5-446f-ae4b-3ece681ac830/54331747431.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 5140 bytes
SHA-256: 30434776fee5b2254df57992845ee58509af566b15c6a0aae8b31697de411d74
font_02_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 11088 bytes
SHA-256: 305f4be4110dd66d441df8e8f2e0207db93c8c9e55306e64a5c42b9ddfdaf617