Malicious PDF — malware analysis report

Static analysis result for SHA-256 344f78bc7e68687c…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 17:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f91dc0bd5e5e0f2a3ba96d7df1d46607 SHA-1: 56cbb290ed3b7d43691479c866376d751046d734 SHA-256: 344f78bc7e68687ce77761baaffc4ecf7f28dd0791076b785287d189eb3ad3bf
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of search results for educational materials. The primary malicious URL identified is golowaki.ru, which likely serves as a redirector to further malicious content or phishing pages. The presence of a large number of external links and the ML classifier's high confidence score indicate a deliberate attempt to distribute malicious or unwanted content.

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://golowaki.ru/strik?utm_term=2nd+grade+reading+comprehension+worksheets+multiple+choice+with+answers PDF link annotation
    • https://taruzabob.weebly.com/uploads/1/3/4/4/134493447/7ab5e8eab83e39a.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/negumuk_welidubororazof_nukesovure_zidalaje.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/thermal_control_system_spacecraft.pdfIn PDF document text
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/timomefigu_vaxedulivaf_jafujonifob.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/ed_sheeran_castle_on_the_hill_acoustic_chords.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/7850632.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/jilot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/us_news_world_report_law_firm_rankings.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_15de964b0f8d40278db0d2dd282b91d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/kivonavopekupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/acc_limited_annual_report_2018-_19.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_da568fa712ca4cf282d2c0a5c1e94c08.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_32dea83b49884c7e944c2909193f5183.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/433c7944-bdce-4b19-a233-d134f5304445/tippmann_98_custom_sniper_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a7db9b-2f98-41c8-9908-7a5554bc0e9f/ribadokaxepima.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_0ccfe65259064977b96bd8e88b041344.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_9ae054c119e94e4c96f05ce78ced2c31.pdf?index=trueIn 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5680 bytes
SHA-256: ac858a2d3536ea831a935bf963e7f3a16459f733fd2c4d0db0ca5aadacad7661
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10688 bytes
SHA-256: a189e389f488dea80ef41b657d4aad326ea0e604d0b12cc687eccfd092d89beb

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