Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bc7d40a7a99f4b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-10 18:35:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a630a7ce6a0c0e249a981a4eafc8e35 SHA-1: 8b730ec72821bddd3b0bfd816e6cc5d964ae1d39 SHA-256: 42bc7d40a7a99f4bd03100c2944cea2e3074424d4adf46a57575ca8044494b64
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is `https://pelibifir.ru/award?keyword=access+consciousness+bars+pdf`. This behavior suggests an attempt to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/award?keyword=access+consciousness+bars+pdf PDF link annotation
    • http://all-host.site/harry_potter_series_book_order8loi0.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/cPzjjjb/classic_soft_rock_radio_stations_online.pdfIn PDF document text
    • http://vashastrahovka24.ru/pmbok_guide_5th_edition_freed5m2r.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/hp_photosmart_d110a_all-in-one_inkjet_printer_ink.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/muvipimorulu.pdfIn PDF document text
    • http://praktika-ingenieur.com/27136532371iz04k.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/tipewijeluzuxibajisinal.pdfIn PDF document text
    • https://cdn.sqhk.co/sapekuzob/f43jihf/av_malformation_mri_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/Ki5hjij/govokuwedosakudanep.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/nGheihs/42263325708.pdfIn PDF document text
    • https://cdn.sqhk.co/kepolapawef/jaijhca/certificate_pinning_android_tutorial.pdfIn PDF document text
    • http://fortuneo-enligne.com/what_are_the_best_books_on_actingo5pka.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/jdNgigf/snake_vs_blocks_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/gdWiegg/crazy_shave_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_4037c10e33bf4f8d9e4a43d1cd8233a3.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_64edf39966ee4e90a809530e865b56eb.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_f065d63dce3f4b8e80209fbd1c15990e.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_786db83f6f5248b9b5e02ec9dec29bf0.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_65b3001fb03a4427bd75292b03217dc2.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_5049173e53b74be68dd40f51a6539c90.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_dfe82f1cb4674082b8735029bf324eb4.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_99847d56d21f4ce99c637d6c922f95d8.pdf?index=trueIn 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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5248 bytes
SHA-256: 83571100989d73d465c0145124a4aa64e2d80ddaf3a8aa95020ce840d247fe26
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10568 bytes
SHA-256: 363e5c4fc9f64cc5c8320358b46602d5d5e7c39e88a4f664e9db312c02a0aa6b