Malicious PDF — malware analysis report

Static analysis result for SHA-256 66625a4e34b4b610…

MALICIOUS

PDF

80.8 KB Created: 2021-03-06 11:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a10b9178c577264e0f7ea8455ae0b737 SHA-1: d3702038adad66423ea45614fb320af3638b1ada SHA-256: 66625a4e34b4b61091429334d65466d7fb04b4ae61dc0821f23a5f29247f23b2
276 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically using a password reset or account recovery theme. It contains numerous external links, many pointing to SEO-optimized PDF files, and one prominent redirector URL (https://nipisod.ru/strik?utm_term=how+to+reset+q+see+password) that likely serves as a phishing page or malware distribution point. The heuristics also indicate a lure to execute commands via the clipboard and instructions for handling password-protected archives, suggesting a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/strik?utm_term=how+to+reset+q+see+password PDF link annotation
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/bedadufari.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/9343dd550.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/1591564.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/4722153.pdfIn PDF document text
    • http://atomlinux.com/waxiwodujupekejegevimarenab2px.pdfIn PDF document text
    • http://healsmall.space/fovasibesj0bfh.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/zidan-jigisurirud-kemumitud.pdfIn PDF document text
    • https://gazuxajolitivik.weebly.com/uploads/1/3/4/7/134770387/5548644.pdfIn PDF document text
    • http://haustova.com/jenobewatezisods6k2d.pdfIn PDF document text
    • http://vinograd.io/fowoguxwxbbn.pdfIn PDF document text
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/zonumegozagidiko.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/nogug.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://s3.amazonaws.com/norozovijalu/retirement_financial_planning_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/maxutejulofizabafabejuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/help_filling_out_self_appraisal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/67302569627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa640782-e70d-4116-ba04-8d3116b46d68/fobazupemewilug.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/4441547470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4663ff9-b31d-422c-80f7-52b000d555fe/python_tutorial_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/kizideruraxidenijino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156c8c50-36cd-49d1-9e57-30bebabdf9d6/2008_honda_civic_ac_compressor_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3126e4ae-85a4-4352-b08e-e0155e10b149/it_jobs_salary_in_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/zofibasixutejumemus.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/35701939241.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 4732 bytes
SHA-256: d8054e82db7bfae983b1b3c060467338319185085315520617cee315cc7587e5
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 10592 bytes
SHA-256: 8dbaffeaf9b10a1534243f883e677405fa25b6adea0a39fc32e1d198d92836f1
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e