Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de6e998e27123a5…

MALICIOUS

PDF

86.8 KB Created: 2021-04-07 23:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0e6e87dcf4385d59ec3a14ed0af178f3 SHA-1: ed3c3f3f6e7b1a629616294999a305653bd1f31f SHA-256: 6de6e998e27123a50e0d146fabd2e666fdaad4439de140d9f7e3aa403753a40d
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm containing numerous external links, with a high ML classifier score and ClamAV detection. The primary malicious URL identified is https://jottigo.ru/123?utm_term=photoshop+brush+tree+free. The document's structure and content suggest it is intended to deceive users into clicking links that lead to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=photoshop+brush+tree+free PDF link annotation
    • http://andyhong.blog/264352310910on09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_6008420556196.pdfIn PDF document text
    • http://matrixbicycles.com/arduino_int_to_char_arrayzkgwm.pdfIn PDF document text
    • http://tokio-2020.fun/watebafgajtk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478393/normal_604f2f982dcca.pdfIn PDF document text
    • http://kinoxca.xyz/190016679344zeub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_605d1a96f0e84.pdfIn PDF document text
    • http://ewwe.space/roku_vs_firestick_201980g6d.pdfIn PDF document text
    • http://axecheat1.xyz/horus_heresy_books_in_chronological_orderu5lwm.pdfIn PDF document text
    • http://ladyso.ru/416630510200c02g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482207/normal_5ff530f71291b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_60453a333292e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_0458ba1e21ac4fc7912af36c1fd84aee.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_32b1c6ff72e54d278238dfc24ea9dbda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9ea9e6-2547-4c08-a5fb-9ebbf5b0b306/34146146599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd58f61-830b-4b53-8658-02acc94573af/gazuge.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_815644f8b04d495290a61fe2f4f05763.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_22fef5a9a11e43a2b18849eefbdee22d.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_a9f2f6d72aab4a14b2d63c38168cbed6.pdf?index=trueIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_57bcf0ef45664d22b538943b29f0661d.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_1bc15a40520d4617a629745a7f1a9abb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 4616 bytes
SHA-256: 05c6bdcd3051041d78af59a796b0f028b156e9c7ffd34483a9617dcda93c121d
font_01_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 10600 bytes
SHA-256: db09e7ac875e5eb6cd521d7015df561a0d7c9ef7a644641f512601c3558eccea
font_02_sfnt_off0001401d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2