Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fa039b11729691…

MALICIOUS

PDF

81.4 KB Created: 2021-03-31 00:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e1f39615e3e57cb7cb012463d0b37af SHA-1: c18fd8480947ff3df46c8273267ba79e3b84b629 SHA-256: 70fa039b117296913575e74c5fb60e06aacf5914512af49293acfdaf0e20d1f2
244 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 ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://yafferge.ru/award?keyword=energia+hidraulica+ventajas+y+desventajas+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 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.
  • 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://yafferge.ru/award?keyword=energia+hidraulica+ventajas+y+desventajas+pdf In PDF document text
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/fukufuwozavu_mijaj.pdfIn PDF document text
    • https://razivixa.weebly.com/uploads/1/3/4/4/134498077/rugubojot_zemasekevif.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hbwfy6b/39966635422.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/71095400399.pdfIn PDF document text
    • http://cardioactiveufficiale.site/chernobyl_tamil_dubbed_movied97e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_602f710f725ba.pdfIn PDF document text
    • http://mjawebdesign.net/withings_watch_battery_replacementh3vml.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/Jqhegeq/lit_romance_fiction_books_for_adults.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/lenikovojitudolawodexem.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/rotilenefexolisegar.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/1281422.pdfIn PDF document text
    • https://pijolonaponezu.weebly.com/uploads/1/3/4/8/134879261/jolipuwoju-vavumurukubufa-lifijezoleza.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/xaxesisowima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480383/normal_5fecbb936d24b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_604a9ce1a8fc1.pdfIn PDF document text
    • http://vnds-v.website/fewudisakufadimakojakj9e7.pdfIn PDF document text
    • http://devgame.design/fototaledomepopunepuga6sonu.pdfIn PDF document text
    • http://fc-aromat.ru/public_relations_manager_job_profileu55tu.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://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_56b0e60e24da4a28a04008b76c3aaec4.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_8cb6b651851a48089cd3ef83dea4de7a.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_491aa8a506e54ec281c743cd8958da1b.pdf?index=trueIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/asus_rt-ac68u_router_login.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/best_java_programming_books_2020.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_f63177fddef04125b3a46d0e0907322c.pdf?index=trueIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_e33f9ba25eea4bbfba514e7cf2b93e1d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 5384 bytes
SHA-256: 479ec4f4900080404d588cffd96c19b909e9cbb81cb3e69d78dcb6ae706cf280
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 11888 bytes
SHA-256: 7e48751dbe45c2462f44b1fbc38af7ffce11198960f40efe68c1536d128d7f6f
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3