Malicious PDF — malware analysis report

Static analysis result for SHA-256 7840f11d8b9ad7f0…

MALICIOUS

PDF

81.0 KB Created: 2021-05-11 15:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23f4292c4b546363473b882826b432ad SHA-1: 62973026bab31d9ff056689b1df945ce69fa0794 SHA-256: 7840f11d8b9ad7f0cea09ecde43bf7d5e7907d3202a15dbb5311901de5527407
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://maypoin.ru/strik?utm_term=how+many+characters+in+les+miserables, is particularly suspicious and likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=how+many+characters+in+les+miserables PDF link annotation
    • http://svarka-aurora.online/681373870933gt4f.pdfIn PDF document text
    • http://baltika-trans.com/britax_advocate_clicktight_forward_facing_tetheru7tqh.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/econometric_analysis_greene_download.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/pomevovojuv.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/44832324229.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/16304090703.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/paletelupozesomed.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/causative_verbs_list.pdfIn PDF document text
    • https://kedadatiwuji.weebly.com/uploads/1/3/4/8/134891749/c36c3f8.pdfIn PDF document text
    • https://jibijuzevigux.weebly.com/uploads/1/3/5/3/135333604/daxazudajolobis.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/5345087.pdfIn PDF document text
    • http://zawazubiwezug.iblogger.org/sorujuxesujan.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/f366fba6-d91e-4185-95c3-e9642e9766ae/zikexovebubujari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247fa801-3c4f-4f05-baff-abd6c556f5b6/how_long_do_water_fleas_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7384599d-59e0-48c2-933e-e3640e8172ad/a_country_practice_season_14_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb59b1d-8944-4400-866c-8027d28a3597/zudiros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6605a3c-1c50-4247-87ec-ea3cb901cb71/how_to_clean_the_bissell_proheat_carpet_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a880828a-4a5b-4585-8938-4aa333a3ce46/43358651545.pdfIn PDF document text
    • http://xesiduzivodugi.epizy.com/molizorerex.pdfIn PDF document text
    • http://kovudefimure.rf.gd/rorejabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112e92c1-5749-42c4-86b8-afa9e795c51d/motajerilu.pdfIn PDF document text
    • http://wupotatide.rf.gd/seruvenenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3614d6ab-28d4-4c91-b780-e88912ebdec6/93593263490.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_off0000fcf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF7 5336 bytes
SHA-256: 30e7eb643291323fb37ad4032641104b9909aae6c1f976bf2f5f7e2ec1085b73
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 11264 bytes
SHA-256: cde77e794a5a5d35b96cc37de7bd52952faa6181cfce27fed254f8b0afd178df