Malicious PDF — malware analysis report

Static analysis result for SHA-256 9538e2f2a88549bd…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 16:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 35dff2f5fe9e811f5f2c8e63b1a06cb4 SHA-1: b8fc1bbe8153e0de48b56a9a1ac10c852ae99c39 SHA-256: 9538e2f2a88549bd924df23888ef67e7cc8ae4ad8c57aa1d4d1e61c4d1b96d14
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to a 'free pdf' download, and the primary URL is associated with a 'breaking the chains' theme, indicating a potential lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/strik?utm_term=breaking+the+chains+of+psychological+slavery+free+pdf PDF link annotation
    • http://ompala.store/coraline_book_hardbackxg4sg.pdfIn PDF document text
    • http://good-production17.site/nokilagawibiwuxixufuu83qd.pdfIn PDF document text
    • http://cetakchantek.com/worum4yc77.pdfIn PDF document text
    • http://fishland.store/both_sides_now_chords_open_di47o1.pdfIn PDF document text
    • http://birjand.design/chopin_sheet_music_preludeb12c0.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/ncert_biology_class_12_2020_free_download.pdfIn PDF document text
    • http://fishland.store/fesasujikakqw538.pdfIn PDF document text
    • http://hookup153.space/97700609210tyzcy.pdfIn PDF document text
    • http://frukt.space/fexeswzyga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futikuzita.onlinewebshop.net/vevitepuku.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_904ec9e11e9f4c0099db38c06e586b6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/acapella_maker_pro_android.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2bb0fb9d3f6f42e8abce29e75f97c7c1.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7e503a9b7eb9457e9644793fedf87663.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_d66b0961958d41f3b49c2c344ab656dd.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_22d6484c7cbe43a2a33cf13409ee60d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/demonstrative_pronouns_worksheet_grade_4.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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5692 bytes
SHA-256: 309d69a863ffa5f5087fc3928d5582943a88b79a0962af81f20dfe2abdca2b1e
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 5076 bytes
SHA-256: 5b76e85574c4d642cdf65072a14ad5abdde8da6db86c002f57afadbad820c9a4
font_02_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 10612 bytes
SHA-256: 9ca977c11cd840a8cec271564ca5b1a7ffedf5a2dee1aa36c562d88e4396495a

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