Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6b20bdda0c01a…

MALICIOUS

PDF

87.0 KB Created: 2021-05-30 08:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3b615294de18a023f4b34056eb4dc92a SHA-1: 25d3e4a6826199d0608b16d1a48467983d78b1bc SHA-256: d1a6b20bdda0c01aa86415b52b9b48cdfe574ff434580ae05c642400e8718c24
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or phishing campaign. The primary URL, 'https://jumiwimov.ru/strik?utm_term=how+to+do+extempore+speech', is likely used to redirect users to malicious content or phishing pages.

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://jumiwimov.ru/strik?utm_term=how+to+do+extempore+speech PDF link annotation
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/wejad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fe28458b80b3.pdfIn PDF document text
    • https://dapamokosow.weebly.com/uploads/1/3/4/3/134337633/muburorolonobobo.pdfIn PDF document text
    • https://jipedopifuxo.weebly.com/uploads/1/3/4/0/134042804/pesazekenekepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ff1bb7b7bef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489846/normal_6028718cab462.pdfIn PDF document text
    • https://gewopisoxow.weebly.com/uploads/1/3/4/3/134306678/zizugoju.pdfIn PDF document text
    • https://xamivozafuju.weebly.com/uploads/1/3/5/3/135308546/8231007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_606e6f11f071c.pdfIn PDF document text
    • https://sepoxoritafide.weebly.com/uploads/1/3/1/4/131438330/zavasenevekemis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_6069c2b3cb474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_6041ef46ebab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_605f50d15770a.pdfIn PDF document text
    • https://novifabapidujup.weebly.com/uploads/1/3/5/9/135975767/8433810.pdfIn PDF document text
    • https://jonilokakowoso.weebly.com/uploads/1/3/1/4/131453896/d1c516e954.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cffe3de2-e8c2-4b0b-94b8-9641ec00b7c5/sentry_safe_keypad_doesnt_light_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73db406b-f6e8-42fe-af4a-9f4adf3a2d30/wabuwodixu.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_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 5192 bytes
SHA-256: 42ff6cb8286a21ecbfba9e728b1f60a396985bd07f5fdb0cd1fd4a68c8249d29
font_01_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 11080 bytes
SHA-256: 25d0cbbfa805c85113bf48df8904d17a9b3c916c9e4149a2de9f8379c6026e97

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