Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa8d66f838757f2…

MALICIOUS

PDF

75.6 KB Created: 2021-03-12 10:35:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fbbe986e70acc5958197c9ced92f3573 SHA-1: d58b3d0a5da86273dc2c4a1fa48c9ccd25188598 SHA-256: 8aa8d66f838757f276769af6f12c766b1d9efcae12583e1e3ff905afa1f3a4b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate an attempt to manipulate search results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=i+too+sing+america+poem+analysis PDF link annotation
    • https://cdn.sqhk.co/reriwoduriju/GghZhia/box_braid_salon_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_60172083e7cb2.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/rfSPxhi/kejun.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Oidgdih/lidakovarapudujowid.pdfIn PDF document text
    • http://wirodapupoz.iblogger.org/english_sentence_translate_in_marathi_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5fe6eeff8ec05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_602252af2d65f.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/kXhe4hj/color_splash_video_effect_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff043713c077.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/cDgh2hj/homescapes_free_coins_no_human_verification.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/Kgjvhhg/go_fish_card_game_two_players.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6610b57a97.pdfIn PDF document text
    • https://cdn.sqhk.co/wifuponi/fhiNggC/wepinun.pdfIn PDF document text
    • http://barefegek.iblogger.org/73424281933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409606/normal_5ffe20799bffc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_1552638065a1407c9bb22196c1cd8643.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_3170557329e44279bd876843a157ba4c.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_7448d5e56e9d4cfc8cee5eedf6c06702.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_a61e09e8ca08474a90ed23510360da46.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_34d520e70774408e99d2788877222c77.pdf?index=trueIn PDF document text
    • http://najejofimepesef.epizy.com/husqvarna_5521p_carburetor_diagram.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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 5292 bytes
SHA-256: a8ea9ee3d241e0f50a34e40fae60f17e6a9f2d87943d675776c5b1e85bbab039
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10928 bytes
SHA-256: 7410297049ac731b69b59db25f2420decf586277c8aae715294753cd6f05f6e4

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