Malicious PDF — malware analysis report

Static analysis result for SHA-256 5494eaf6870dcba3…

MALICIOUS

PDF

75.3 KB Created: 2021-01-13 14:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e5810c37e3a72c198c1c8f96cbc693d0 SHA-1: 77b33c42aa49858936b4b38abf48301579438a98 SHA-256: 5494eaf6870dcba352c74f63fc0d56251bd7b2b7055264d11db9569040b0fc66
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains numerous links to external sites, many of which are hosted on disposable domains or known redirectors, indicating a link farm designed to distribute malicious content. The heuristic 'SE_SECURITY_BYPASS' suggests the document may instruct users to disable security software, a common tactic in phishing or malware delivery. While no scripts were explicitly extracted, the presence of many embedded URLs and the ML classification strongly suggest malicious intent, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://traffking.ru/aws?utm_term=miracle+thunder+update+2.+98 In PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jdZUjiY/where_can_you_buy_fake_nails_near_me.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/668b3f04b7.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/hgcgjxr/zujewaferaxoxeb.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/xjgiahb/99866738859.pdfIn PDF document text
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/1157225.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5fa532b316a40.pdfIn PDF document text
    • https://xefomivor.weebly.com/uploads/1/3/0/8/130814633/6c9b83f940.pdfIn PDF document text
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/3295439.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/jgc1Ucp/21396553264.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/f41hahf/highway_traffic_race_2018.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kasibe-mibotuwesetoz.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/c9f96d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_5fc718be306aa.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/4265222ee.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/zazelujeju/lagu_the_overtunes_cinta_adalah_lirik.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/pupujelufawerorosewex.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_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 5500 bytes
SHA-256: 482ca188a41fb13fed2aa8ef762f3d93edeb8af3e24470b66d015a6ce31e6975
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 11296 bytes
SHA-256: 3abee0136f18936f5b69a24dc829973f0d409a3bfa9c00fd87a5f73df87617ab

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