Malicious PDF — malware analysis report

Static analysis result for SHA-256 744515fa3df8fb54…

MALICIOUS

PDF

85.2 KB Created: 2021-03-24 03:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 683ddab7e73ace52bb9f7b20e4617836 SHA-1: bb083a8c4511ad2efa5f53656460d84d5e7a895e SHA-256: 744515fa3df8fb54bb8fa132edf8cb44692b85f275b3f3fdab99011fad5b3dde
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=stihl+fs+56+rc+spark+plug PDF link annotation
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/7fa979b29832c04.pdfIn PDF document text
    • https://rebafanivine.weebly.com/uploads/1/3/6/0/136054257/jimuza.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/losujiz.pdfIn PDF document text
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/1314481.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/5e9dced4-dd19-4c8e-b079-5f8ba40b329f/82146938935.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_f00e3e00046b4e04acadabe1cbde2d7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ed96f05-493b-4c88-b491-2cff787eed9a/31250995327.pdfIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_03311a8d0aa94b27b760add8bf334c09.pdf?index=trueIn PDF document text
    • http://rejaromavovelu.rf.gd/juwojalug.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_83496966cab344128672cfd238f237bb.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_ac92394dc6574babbd8681253f14436a.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1cb34a2f90104778a14426f95d71e948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76106a61-5183-430a-bda8-0b463561232e/nuzasob.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_b845a4d4dd0b48e1b527f5662e7d4250.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_dacc257c84b442eaae541481335c66fe.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_eadc45fecc17426699021a64d9c0fe57.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51872378-46b2-4aa1-928b-5574e7527d67/what_does_it_mean_when_a_smoke_alarm_flashes_red.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_ecf96def89fa4d6a929eefc072da32e4.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_f4fc783d5794452f8b73c64a80138c42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/780fdc59-f3fd-4735-8ed3-409dd8e8c871/78763096484.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_790eb25663dd424893a0c45a7813b57d.pdf?index=trueIn PDF document text
    • http://latujetob.epizy.com/droid4x_emulator_for_windows_10.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_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 5724 bytes
SHA-256: 2e87c8870f752ee6983637369f2f7b661e7b39b9b99d72cd35d53bb2c9c8959f
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 11460 bytes
SHA-256: 6d6a996bdc8862695e07f22b970d2bad01c4fe7978dbc6d87c58aed1a293fd9a

Open this report in the interactive analyzer, or submit your own file for analysis.