Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be2c535317b14c4…

MALICIOUS

PDF

77.0 KB Created: 2021-05-10 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1d83e491d27d3741550335f6948b0651 SHA-1: 075a2ec863a5ee61d83d37382cd27da837796154 SHA-256: 1be2c535317b14c4f93595e68b81a94bdc1590caec818b530f95c5575bc906ed
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. The presence of embedded URLs and the link farm heuristic suggest the document's primary function is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=pharmacy+math+practice+problems In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_602c5acb84105.pdfIn PDF document text
    • http://dsv-trening.ru/52034614029yw8v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fe82dbd63370.pdfIn PDF document text
    • https://cdn.sqhk.co/daxutoxod/RILyFZR/20821695272.pdfIn PDF document text
    • http://rajizaloka.iblogger.org/what_is_not_considered_a_computing_innovation.pdfIn PDF document text
    • http://123dutch.com/occupational_safety_and_health_act_1970mhreo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_5fed667a09a92.pdfIn PDF document text
    • https://cdn.sqhk.co/sugumujozik/bWjiPia/jay_mcinerney_interview.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_6040d79e9787f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_5fdcc289b3fea.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/iif0igo/memakovo.pdfIn PDF document text
    • http://premial.su/12579451268wxz49.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/dZh7jgY/slogan_save_mother_earth_quotes.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/xisetajesamupamuxuiysw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_b3b62519a7f148a191b0af78d16a6a19.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_4e7278302da3468bb45f56c9dec5c177.pdf?index=trueIn PDF document text
    • http://nisifibuvez.epizy.com/vufufaxuvukogan.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_2835b24bdf9a4a0ab23a3a2fb08dbe4c.pdf?index=trueIn PDF document text
    • http://fofifalog.rf.gd/79905562175.pdfIn PDF document text
    • http://sudebitije.rf.gd/how_to_solve_an_isosceles_triangle_angles.pdfIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_d0c0aa284ac3459a85f0ba7d4814e266.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/how_to_read_a_book_chapter_summary.pdfIn PDF document text
    • http://pubitawiwinas.rf.gd/10301417110.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/can_you_report_car_accident_online.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5416 bytes
SHA-256: a56d8b11bdfe51e8624e14b0d6b4cd9d3be6672cbeb25d044f5aa826a024efe0
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 11208 bytes
SHA-256: e531831787fdda0a5711919d4d3144a0215567a24a5985e8a1295d2ddf39995d