Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b1d7d8fdba02b2…

MALICIOUS

PDF

89.8 KB Created: 2021-05-21 17:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 40399ffa7ee1357781e1e8568feecc09 SHA-1: e3273587c1aa986f1e6b401267373c36eb69c96a SHA-256: 76b1d7d8fdba02b2beba4e9cb12da57c8f7284e4e82571157954451bb84a92a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary URL, https://crophysi.ru/strik?utm_term=3d+map+generator+terrain+free+online, suggests a potential lure for SEO manipulation or phishing. The file's structure and the presence of many external links strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/strik?utm_term=3d+map+generator+terrain+free+online PDF link annotation
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/xaliwogaxa_mejuvow_sotiz_nozupejezot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fde766e2b2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491173/normal_60294420e012d.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/matemananev_japujufuf.pdfIn PDF document text
    • https://tepogixe.weebly.com/uploads/1/3/1/4/131437844/6553133.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/sizepirupov.pdfIn PDF document text
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/jezewogetavov-sotim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_601f5f831662f.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/xifovedalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_601d618861ca3.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/1d8b4e7.pdfIn PDF document text
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/8662166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601764df0817b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ff436d05d689.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/a4b4c62e-3ebf-4e5d-ae17-76eb4e3ace06/mireresijejujolenima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b5ba01-6863-445a-8043-61b42eafc234/solution_manual_principles_of_geotechnical_engineering_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e4c09a-f7a0-4dc3-a262-1a061d5138df/princeton_university_basketball_offense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af083dfd-ea5a-423a-a403-d002b80e977c/how_to_do_finishing_stitch_on_needlepoint_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842c5894-0679-4bfe-b4ae-497a2c33e1cf/1237476623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bb6906-f812-4798-9409-d4da45e95679/duximobudemokomuguwites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c02f4c4-4375-49fc-b316-d52b4720f831/rosobojorelupapuvese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfeab79-506d-424c-9666-8af2b0d78fc3/dell_latitude_e6410_core_i5_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c03f6f-d434-42ab-9f39-def9dc7b5ee0/76600549829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e7676ff-6236-443a-954b-3e3e5f66b454/how_to_open_dell_precision_5510.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_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 5252 bytes
SHA-256: 44ae7ffb7a0a52d77fea39b3235d52a6b41a1f691e161e22a1d91670639d4b48
font_01_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 11552 bytes
SHA-256: 9f0dedcad2f67ec335dc46cfa08616488ab23d94c00453f2d8afdc7d375064dc

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