Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7525c4b8993e0e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-13 18:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 345fefb61765bcf5d1498a2ce5a3576d SHA-1: afbb67e51c450e370893348e8790c41644ad2355 SHA-256: 5a7525c4b8993e0ec0b1b8dd046c12a3d0895e2ea1b74768f83ed01d47371350
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to disposable domains, and one prominent URL that appears to be a lure for downloading an audiobook. The document body, though heavily obfuscated, suggests a similar theme. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=me+before+you+audiobook+free+download+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499282/normal_603c0de848910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463277/normal_5feda2c4dc646.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/LSxe7hi/78543717720.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/mp3_bangla_bcs_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_602d22da2a3de.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/xubakefamofodovogifasaval.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/hgDhehj/89374491426.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/gf3xzYv/chris_stapleton_new_song_starting_over_lyrics.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/bakododigofar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60374825b2886.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/anaesthesia_equipment_book.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/tigivokejematedazegin.pdfIn PDF document text
    • https://cdn.sqhk.co/boxewemutox/iguic0V/87560023528.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/the_pigman_summary_chapter_13-15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_60436c4aebcc6.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/2662448c-c5d6-47d9-a26f-ca6d0b102de5/ritakixosipuxarodapa.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/real_world_range_of_tesla_model_3_long_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd5b44d-ca39-4d95-92f0-685500511cc6/15364651868.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_eb793b901e1048c69996982ed419e7a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbf99c8-5634-4549-a1c5-4a2dfb529d61/biblia_reina_valera_audio_online_gratis.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/nozokokawazijexekukoduxef.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_5b029db0973e47f187105d896deadd24.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_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 5576 bytes
SHA-256: 1d56302bdafe97f04b0957c4c6f5709184dbc83b5b9bdc81e1e8312193cb64ac
font_01_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 11052 bytes
SHA-256: d83cb3fd8cdbde0fb19b57ed052077a37bb330c8074d8ae082cb5142e6320c6b

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