Malicious PDF — malware analysis report

Static analysis result for SHA-256 144a82b6be0101f9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-24 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3003ff23323ebad8166a94f8a40df0c2 SHA-1: d971b52ad1d662eb2ecdf8ec64fee4c8cebda620 SHA-256: 144a82b6be0101f9bf09938e627e17bc155d2d452c2fa21527d851dc3baed1bf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=howard+miller+grandfather+clock+chimes+not+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485696/normal_5ffd5ee8170fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_6051dfcdb86dd.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/cgfETij/54010438477.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/5qtiaUs/8656505810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fd38fba436a5.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/950045.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/737547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_7e33b90a404a4c90bef4c7980f6545b0.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_008d2249181940c4ac861da5aaa02c92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/punjabi_badmashi_status.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95762993-e226-4aaf-9349-44f34da4d78f/4117231227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb1f086-7d78-4775-9e31-aab640e1aef8/57310489729.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_9d48a810cf914a1e8d89003824218171.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_1fe3e086165443e89bfb02169ac95c40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6980d10-3dc9-4624-a4d8-9b367b0c183e/gekapowux.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/63562011562.pdfIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_d83255e26c8941d0b86495889b8cf5eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f881968-fae1-4d6a-b860-db962a6fb659/clarion_meaning_adjective.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5552 bytes
SHA-256: c71e21677f457426cfa0b016d5883baf7074835b64433f97811b55b53978d10f
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 10800 bytes
SHA-256: 35a21e7f0f224b59546d63fc94380b54adeaa34697582f0e423f63afa182f774

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