Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f54df54b8394520…

MALICIOUS

PDF

139.2 KB Created: 2021-02-19 21:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6f0962ed6f4201a35c2fd2070aa015ac SHA-1: 77549c5955d415472b7b609a952df78f22e5916e SHA-256: 9f54df54b8394520ea5e35cc0ce4fc8d009827cd2f4969942f3737d452637f0e
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=mary+poppins+returns+cameos+balloon+lady PDF link annotation
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/2549257.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/rutuxis.pdfIn PDF document text
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/3af5eba883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498678/normal_5fd8ed9e193ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_600fe32e3eb0d.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/DrgdhaJ/top_fashion_dress_up_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/ykxSDgc/54721985455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_6019545160702.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/h3jepAW/zanejowigumip.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jbzJmhj/vector_parkour_game_online_unblocked.pdfIn PDF document text
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/rezalomar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fd7e0373afbb.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/fd28ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/bar_graph_template_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/flight_simulator_advanced_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/belstaff_overshirt_size_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001e9f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E9F7 29392 bytes
SHA-256: b423d24dc40db2aa0dc687885b24d3150f549e53a09c3777e4c9e3b9533b7df3
font_00_sfnt_off0001afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFCB 5468 bytes
SHA-256: 456453d8154f7e133a5ad29cc7e877b1a2ca72090cf27b962557a0f02a4c2d45
font_01_sfnt_off0001c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C258 11632 bytes
SHA-256: c70f391078adc8c966e7f15502f76aec248eef87e506129ba87b02aa63b6722d

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