Malicious PDF — malware analysis report

Static analysis result for SHA-256 5924b188881b7140…

MALICIOUS

PDF

80.3 KB Created: 2021-05-31 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cc0f9b1e86b13d0889d908be7442e945 SHA-1: 1a508cc5d75b0c1c98c8dd4f4a06dd28172a378d SHA-256: 5924b188881b71404912b2f9b6270340ebaba03f01f1148cf4835a36a4188da1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://zajinet.ru/123?utm_term=old+girl+guide+campfire+songs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=old+girl+guide+campfire+songs PDF link annotation
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/sanabajazu.pdfIn PDF document text
    • https://sefezepijimife.weebly.com/uploads/1/3/4/7/134733313/8c67a691c00c.pdfIn PDF document text
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/7357468.pdfIn PDF document text
    • https://laboxowoxom.weebly.com/uploads/1/3/5/4/135400847/8434274.pdfIn PDF document text
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/7098138.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/7239cb.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/5cbd640.pdfIn PDF document text
    • https://vifedunujaxali.weebly.com/uploads/1/3/4/3/134398483/7665100.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://uploads.strikinglycdn.com/files/7ab2ba04-87c0-41dd-aac7-68d69b8d5967/2971656618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9144c83-a31b-4e81-8cf7-c58d814f4846/linear_algebra_problem_book_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed04d71-e153-4aad-b559-e9317c135ecb/what_is_google_workspace_business_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043a4e6f-a34b-4ff4-9981-da5f08027bee/46561246952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7df2900-7345-44e7-9814-de3d56e5591e/41619387232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4a4ded-b8a4-493b-b4e7-54055bcdcf5e/fofevasow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93215f1-7b8a-4078-bb92-b6b75d35803b/65804593063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325dc872-e8ea-42b2-bf7d-54654529832b/the_natural_bernard_malamud_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b50515e-43ec-4bba-a634-b7455ac5ba7a/zazidedolememad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83ef121-0da0-4d19-b48e-6153b0655981/how_to_make_line_drawing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec2537c4-3f38-46d8-821a-97f2016d786a/how_to_become_a_fair_trade_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3530c023-cd6e-4abc-ad26-57f8ea164cc7/how_do_you_maintain_a_coleman_hot_tub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9b7367-8cc9-4185-8dea-199030ad43a4/franklin_wireless_r910_mobile_hotspot_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bc087b-aff3-444f-8a88-f9b0ba8c8db4/how_much_to_ship_fedex_international.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 5304 bytes
SHA-256: fa872956ba76fcdd167326d0604170a0d4f1c2c464cedda275347880447a88d3
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11020 bytes
SHA-256: f59116688252f5281a71b4fd6fdb5015a281efd953a1c53cf7105d0d7118d7d7
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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